CO Detector
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How to Find the Serial Number for Your SimpliSafe® Device or Camera
During troubleshooting or for account verification purposes, you may be required to identify the serial number for a product within your system. You can easily find the serial number for your devices or cameras within the SimpliSafe® Mobile App.
Locating the Serial Number for your Base Station in the SimpliSafe® App
Open the SimpliSafe® Mobile App on your phone or tablet
Tap on the three-bar menu (hamburger menu) in the upper left corner of the app screen
Choose Help & Support
At the top of the menu you’ll see an Account Number
This is the serial number for your Base Station
Locating the Serial Number for your Devices or Cameras in the SimpliSafe® App
Open the SimpliSafe® Mobile App on your phone or tablet
Choose My System from the bottom navigation bar
Tap on the Device or Camera you wish to manage
Scroll down to Basic Info
Your device or camera’s Serial Number will be listed here
There may be a point where you need to find the serial number on the physical device itself. The rest of the article will guide you through finding the serial number for each product. Click to expand the collapsible section for the product type you wish to learn more about.

The serial number for the Base Station can be found on the bottom of the unit, right underneath the QR code.

The serial number for the Keypad can be found underneath the battery cover, at the bottom of the device. Simply slide the Keypad off the bracket (battery cover), then turn it around and look towards the bottom of the battery compartment to see it. The serial number will be listed above the manufacturing date.

The serial number for the Key Fob is found on the tab at the bottom of the device. Flip the Key Fob over so its back is facing you and look at the tab to find its number.
Entry Sensor

To find the serial number on the Entry Sensor, simply remove the Entry Sensor from its bracket. To remove it from the bracket, locate the pairing button on the sensor, then slide the sensor up towards the button. Once the sensor has been removed from the bracket, look at the battery and the serial number will be right above it.
Motion Sensor Gen 1

The serial number for the Motion Sensor Gen 1 is located right above the sensitivity slider. To expose the battery compartment for viewing, gently grip the Motion Sensor and slide it up and off its bracket. You may need to wiggle it or use light force to push the sensor off the bracket. Once removed, look for the “sensitivity” embossed on the plastic. The serial number will be above it.
Motion Sensor Gen 2

The serial number for the Motion Sensor Gen 2 is located on the back side of the sensor in the upper right corner underneath the QR code. To locate it, remove the Motion Sensor Gen 2 from its’ bracket, by either wiggling it side to side then pushing up towards the pairing button. You may need to use light force to accomplish this. Once the battery is exposed, you’ll find the serial number in white text underneath the QR code.
Glassbreak Sensor

The serial number for the Glassbreak Sensor is located above the sensitivity slider on the back of the device. To expose this area and the battery compartment, simply slide the Glassbreak Sensor off its bracket by wiggling it back and forth then up towards the pairing button. You may need to use light force to accomplish this. Once exposed, locate “sensitivity” embossed in the plastic, and you’ll find the serial number right above that.
Panic Button

The serial number for the Panic Button is located within the battery compartment for the product. To expose the battery compartment, slide the front of the Panic Button up and off its bracket - being careful not to press the Panic Button during this process! Once exposed, you’ll find the serial number at the bottom of the device.
Extra Siren

The serial number for the Extra Siren can be found on the back of the device, underneath the bracket. To remove the Extra Siren from the bracket, simply slide it up and off the bracket. You may need to use light force to accomplish this. You do not need to remove the battery cover to see the serial number. You can find it at the bottom of the product, next to the QR code or in between the two screws at the bottom of the product.
Temperature Sensor

The serial number for the Temperature Sensor (Freeze Sensor) can be found within the battery compartment on the device. Simply slide the product off its bracket by wiggling it side to side then pushing up towards the pairing button on the product. You may need to use light force to accomplish this. Once the sensor is removed from its bracket, you can locate the serial number next to the QR code, at the bottom of the battery compartment.
Water Sensor

The serial number for the Water Sensor is within the battery compartment. To expose this, you’ll need to twist the Water Sensor base and top apart from one another, rotating it counterclockwise. Once they are separated, you’ll find the serial number below the battery, opposite of the QR code. If you need to reassemble the Water Sensor, line up the arrow on the top and bottom pieces, then twist them back together. They should seamlessly rotate to create a water-tight seal, so do not apply pressure or force them to go together if the arrows are not lined up.
Smoke & Carbon Monoxide Detector

The serial number for the Smoke & Carbon Monoxide Detector can be found on the back of the device, after removing it from its bracket. To remove the Smoke & CO Detector from its bracket, rotate the detector counterclockwise. The serial number will be to the right of the QR code, in white text on the black background, right above the manufacturing date.
To reassemble the Smoke & CO Detector, twist the detector back onto the bracket moving it clockwise. It should click into place once secured. If it’s not fully attached to the bracket, it could result in a tampering error, which can cause your Base Station to beep repeatedly, signifying the trouble signal.Carbon Monoxide Detector

The serial number for the Carbon Monoxide Detector can be found on the back of the device, after removing it from its bracket. To remove the CO Detector from its bracket, rotate the detector counterclockwise. The serial number is right above the center of the device on the back of the product. You can find it by looking for “S/N:” followed by a string of letters and numbers.
To reassemble the CO Detector, twist the detector back onto the bracket moving it clockwise. It should click into place once secured. If it’s not fully attached to the bracket, it could result in a tampering error, which can cause your Base Station to beep repeatedly, signifying the trouble signal.
Smoke Detector

The serial number for the Smoke Detector can be found on the outside of the device, on a sticker that denotes “S/N:” followed by a string of numbers and letters. You may or may not need to remove the Smoke Detector from its bracket to view the serial number. If you need to remove it from its bracket, simply twist it counterclockwise.
To reassemble the Smoke Detector, twist the detector back onto the bracket moving it clockwise. It should click into place once secured. If it’s not fully attached to the bracket, it could result in a tampering error, which can cause your Base Station to beep repeatedly, signifying the trouble signal.
Outdoor Camera Series 2

The serial number for the Outdoor Camera Series 2 is located on the back of the camera lens (or cap, as we call it). To remove the lens from the body of the camera, simply rotate the cap clockwise. Then, turn over the cap to expose the product information. You’ll find the serial number underneath the QR code, in white text on the black background.
Outdoor Camera

The serial number for the Outdoor Camera is located on the back of the camera lens (or cap, as we call it). To remove the lens from the body of the camera, simply rotate the cap clockwise. Then, turn over the cap to expose the product information. You’ll find the serial number to the left of the QR code, in white text on the black background.
Video Doorbell Pro

The serial number for the Video Doorbell Pro can be found on the back of the device. To remove the Video Doorbell Pro to expose the serial number, you’ll need to remove the security screw from the bottom of the device, using a T5 Torx Screwdriver. Once the screw has been removed, gently remove the Video Doorbell Pro faceplate from the bracket. Flip the camera over, and you’ll find the serial number underneath the Model Number, just to the right of the QR code.
Smart Alarm Wireless Indoor Security Camera

The serial number on the Smart Alarm Wireless Indoor Security Camera can be found on the backside of the camera, right underneath the QR code.
SimpliCam® Wired Indoor Security Camera

The serial number for the SimpliCam® Wired Indoor Security Camera can be found on the back of the SimpliCam®. There is a white sticker towards the top, and you’ll find the serial number underneath the Model Number to the right of the QR code.
Smart Lock Series 2

The serial number on the Smart Lock Series 2 can be found right above the battery compartment on the back of the Smart Lock. This is the part that is inside of your home or business, not outside of your door. To access it, slide the battery cover to the right to remove it. Then, locate the serial number in the center on the upper portion of the back of the Smart Lock itself.
Smart Lock
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The serial number on the Smart Lock can be found on the back of the Smart Lock itself, the piece that goes inside your door. To remove this, you’ll need to use the included Release Tool. If you no longer have the release tool, you can always use a small flathead screwdriver, similar to one you would find in an eyeglass kit.
To remove the Smart Lock:
Using the Release Tool (or a small flathead screwdriver) slide out the two wing latches on each side of the device
After sliding out the wing latches, you can pull the Smart Lock off the door.
Once removed, you’ll find the serial number in the center right above the wing latches, right underneath the FCC ID embossed section.
When it comes time to place the Smart Lock back on your door, refer to our Smart Lock Installation Guide on the Help Center.
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Product Support
What is the Constant Yellow Light on the Smoke and/or CO Detector?
The Smoke Detector, Carbon Monoxide Detector, and 2-in-1 Smoke & CO Detector all feature a Tamper Switch, to make sure that the device is properly secured into its mounting bracket.
It’s a small button on the back of the unit that is normally held down by part of the mounting bracket. When it is not held down properly, you will get a warning signal:
Smoke Detector: Solid yellow, chirps every minute
Carbon Monoxide Detector: Solid yellow, chirps every minute
Smoke & CO Detector: Yellow light flashes every 4 seconds, chirps every minute
When placing your Smoke Detector, CO Detector, or Smoke & CO Detector, back into its mounting bracket, make sure to twist it fully until you hear it snap into place. The yellow light warning should stop immediately.
If you still see that yellow light, it is possible that the mounting bracket itself may be screwed into your wall or ceiling, causing the plastic to warp slightly. It may help to unmount the unit and slightly loosen the screws. Then try mounting the detector again.
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Smoke & CO Detector
How SimpliSafe® Products Respond During an Alarm
SimpliSafe’s® Professional Monitoring protects your home or business across many types of alarms. Depending on your monitoring plan and alarm type, when an alarm is triggered, you’ll be notified through App Push Notifications or Alarm Text Messages. You’ll also be able to interact with our in-app Alarm Screen to cancel alarms or request help from emergency responders.
Alarm types are divided into four categories:
Burglary (Entry, Motion, Glassbreak, Panic Button, Duress)
SimpliSafe® Active Guard Outdoor Protection Alarms (Pro, Pro Plus plans only)
Life Safety (Fire and Carbon Monoxide)
Environmental (Water and Temperature Alerts)
If the system is disarmed within a few moments of the initial alarm signal, this will be considered a false alarm by our monitoring center. That means you will not receive a phone call, as we assume you are safe, and emergency services will not be requested to your location.
Entry Sensor, Motion Sensor, and Glassbreak Sensor
When your system is in an armed state (Home or Away mode) and one of these sensors is triggered, a countdown will begin unless you have configured Instant Trigger. The Entry Delay default is 30 seconds, but can be adjusted up to 4 minutes in the SimpliSafe® Mobile App. If you do not disarm your system before this entry countdown elapses, the alarm will sound and you will need to cancel the alarm in order to prevent the dispatch of emergency services.
Panic Button
When the button on the Panic Button, Key Fob, or Keypad is pressed for 2 seconds, it sends a notification to the monitoring center* that you require assistance at your location. Your Panic Button can be configured in several ways, which results in different scenarios that play out in the event of an alarm. Under all configurations - except Silent Alarm - you’ll receive an Alarm Text and a phone call to confirm the status of your location.
Please note that alarms triggered by Panic Buttons are not able to be cancelled via Alarm Text or the SimpliSafe® App in order to ensure your safety.
*The Panic Button will only alert the monitoring center of the emergency at your location when subscribed to a professional monitoring plan.
Duress
SimpliSafe® Security Systems are equipped to set up a Duress PIN that you can enter if you are being forced to put in your system information. This PIN type is for emergencies. If you enter the Duress PIN into your Smart Lock’s PIN Pad or Keypad, our monitoring team will request dispatch of emergency services immediately. You will not hear an alarm siren or get a phone call for your safety.
We hope you never have to use this feature, but it’s important to set it up and learn more about it to arm yourself with the knowledge to protect yourself. Please make sure the Duress PIN is uniquely different from your Master PIN to reduce the likelihood of entering it by mistake and receiving dispatch unintentionally.
When you pair your Outdoor Camera Series 2 with a Pro Plus or Pro Monitoring Plan, you’ll get access to SimpliSafe® Active Guard Outdoor Protection. Once you’ve enrolled your camera(s) and armed your system within your monitoring hours (24/7 for Pro Plus subscribers, 8pm-6am local time for Pro subscribers), your cameras will be on the lookout for intruders. When someone who does not match a Familiar Faces profile is seen on camera, our monitoring specialists will choose to engage with the individual through the camera’s two-way audio, and request dispatch to your location as necessary.
Smoke-Related Alarms
When the Smoke Detector or Smoke & CO Detector detects particulates consistent with smoke, or the Smoke & Carbon Monoxide Alarm Listener hears your third-party smoke detector go off, it will sound the alarm to notify you of the potential hazard.
After the alarm has sounded, two things will happen at once, depending on your monitoring plan. The Primary Contact(s) of that location will receive an Alarm Text, and the first Primary Contact will receive a phone call from the monitoring center. Alarm Texts and push notification from the SimpliSafe® Mobile App for life safety events are only to alert you of the hazard, and cannot be used to cancel the alarm, disarm your system, or request dispatch.
Primary Contacts can cancel the alarm or request help from your local fire department for smoke over the phone without the need for your Safe Word. You can also cancel smoke alarms by disarming your system with your PIN at the Keypad.
If you do not answer the phone or cancel the alarm at your Keypad in a timely manner, our monitoring team will automatically request dispatch from your local fire department, who will be dispatched to the location address on file for your SimpliSafe® system.
Carbon Monoxide-Related Alarms
When the Carbon Monoxide Detector detects carbon monoxide, or the Smoke & Carbon Monoxide Alarm Listener hears your third-party carbon monoxide detector go off, it will sound the alarm to notify you of the potential hazard.
After the alarm has sounded, the first Primary Contact will receive an Alarm Text and a phone call from the monitoring center. Alarm Texts and push notifications from the SimpliSafe® Mobile App for life safety events are only to alert you of the hazard, and cannot be used to cancel the alarm or request dispatch.
Note: Due to the serious and potentially life-threatening nature of carbon monoxide poisoning, there is no way to cancel carbon monoxide alarms. If a CO alarm is triggered, we will request dispatch to the location on file for your SimpliSafe® system.
Temperature Sensor
The Temperature Sensor will sound an alarm when it detects that the temperature within your home or business has gone above or below the temperature range that you set. This can help alert you to the potential hazard at hand, such as the potential for freezing pipes, or the cooling within your home no longer working during a heat wave.
When an alarm is triggered you will receive push notifications, Alarm Texts, and an automated phone call. The call is placed to the Primary Contact first, followed by the Secondary Contact in the event the Primary Contact does not answer. We do not request for dispatch to your system’s location for these alarms.
Water Sensor
The Water Sensor will sound an alarm when it detects water in its chamber. This could be the result of a small leak, or something more dangerous like flooding within your home or business.
When an alarm is triggered you will receive push notifications, Alarm Texts, and an automated phone call. The call is placed to the Primary Contact first, followed by the Secondary Contact in the event the Primary Contact does not answer. We do not request dispatch to your system’s location for these alarms.
Alarm Texts
Beyond disarming at the keypad, you also have the option to cancel the alarm or request dispatch of emergency services by Alarm Text. If you respond to the text with a C during the grace period, you won’t receive a call from our monitoring center.
You can also disarm your system via Alarm Texts after burglary alarms by replying back with “Disarm now” to the disarm text prompt. This is not case sensitive, so replying back with “disarm now” will also work. Disarming your system via Alarm Texts is a great way to ensure that subsequent alarms don’t occur while you work to get back to your home or business.
Alarm Texts for life safety events are only to alert you of the hazard, and cannot be used to cancel the alarm or request dispatch.
SimpliSafe® Mobile App
If you have alarm Push Notifications turned on, you will get a notification during an alarm that will take you to our Alarm Screen feature in the SimpliSafe® app where you can cancel your alarm (depending on the alarm type) or request help with the touch of a button.
If the alarm is not cancelled by any of the above methods within the grace period, the Primary Contacts will receive a call from our monitoring center. During this call you will be required to provide your Safe Word to the agent you speak with to cancel the alarm.
Please note: providing the wrong Safe Word, or no Safe Word, will result in a request for dispatch. You won’t be told you got it wrong to protect anyone who may be under duress. Additionally, missing the phone calls to your Primary Contacts will also result in a request for emergency services to the location that your system is registered to.
Carbon Monoxide Alarms Exception
Due to the potentially life threatening nature of carbon monoxide events, you are unable to cancel these alarms through any method and emergency services will be requested to your location.
We encourage you to save the monitoring center number to your phone.
That number is 855-693-4911.
Critical Alerts and Do Not Disturb Settings
Once saved to your phone, you’ll also want to allow us access to bypass Do Not Disturb and Silent Profiles. This allows for Critical Alarm Notifications to get through to you, regardless of your phone’s volume or profile status.
You can navigate each section below to learn more about how our products respond during these key alarm moments.
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Product Support
CO Detector LED Status Light Colors
The Carbon Monoxide Detector has several light states that reflect the status of the device and its detection of CO within your home. This guide will highlight the various indicators and their meanings.
Light
Sound
Description
Flashing Green Light
No Sound
Green LED flashes once every 60 seconds, which means the unit is receiving power and also indicates it is functioning properly
Solid Yellow Light
Chirping Once a Minute
Blinking Yellow Light
Chirping Once a Minute
Replace the battery; Batteries are expected to last 3-5 years, depending on placement and usage
Blinking Yellow Light
Chirping Every 2-4 Minutes
Malfunction Error. Our Support team can send you a replacement
Blinking Red Light
No Sound
CO Detected. Move to fresh air as soon as possible
Blinking Red Light
Beeping Every 5-60 Seconds
Dangerous levels of CO detected. Move to fresh air immediately!
No Light
No Sound
Replace the battery; Batteries are expected to last 3-5 years, depending on placement and usage
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CO Detector
How To Replace Carbon Monoxide Detector Batteries
The CO Detector takes three (3) Energizer AA "UItimate Lithium" 1.5V batteries and has a life expectancy of 3-5 years depending on placement and usage.
To change your CO Detector batteries, twist counter-clockwise to remove the device from its bracket. Avoid pressing the test button while removing it, as this alert signal can be loud. Press the transparent button on the detector and slide the battery cover back. Then replace the three (3) batteries and slide the detector back into place.
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CO Detector
How Does the Carbon Monoxide Detector Respond During an Alarm
When the Carbon Monoxide Detector detects particulate consistent with carbon monoxide, it will produce a siren as well as the following products:
Base Station
Extra Siren
Wireless Outdoor Security Camera
Outdoor Security Camera Series 2
Wireless Indoor Security Camera
After the alarm has sounded two things will happen at once, depending on your monitoring plan. The first Primary Contact will receive an Alarm Text, and also a phone call from the monitoring center. Alarm Texts for life safety events are only to alert you of the hazard, and cannot be used to cancel the alarm or request dispatch.
Due to the serious and potentially life-threatening nature of carbon monoxide poisoning, there is no way to cancel carbon monoxide alarms. The phone call made to the first Primary Contact will notify you of the alarm. If you do not answer the phone, our monitoring team will automatically request dispatch from your local fire department who will be dispatched to the location on file for your SimpliSafe® system.
We encourage you to save the monitoring center number to your phone. That number is 855-693-4911.
Once saved to your phone, you’ll also want to allow us access to bypass Do Not Disturb and Silent Profiles. This allows for Critical Alarm Notifications to get through to you, regardless of your phone’s volume or profile status.
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CO Detector
Testing the Carbon Monoxide Detector
Test Mode is a great way to test the connection between your Base Station and other SimpliSafe® products. We recommend periodically placing your system into Test Mode to ensure that your devices are still communicating with the Base Station without any errors.
Placing Your System Into Test Mode
Disarm your system by pressing OFF on the Keypad
Press the Menu button on your Keypad
Enter your Primary PIN
Scroll until Test Mode is highlighted
Use the right arrow key to enter Test Mode
You’ll know you are in Test Mode when you see a circle on the Keypad appear with the text, “Test each device by pressing its button.”
Note: If you subscribe to monitoring, you will receive a robo call from the monitoring center asking you to confirm you placed your system into Test Mode. If you do not answer – no worries! A voicemail will be left to alert you to the system test, and it will not result in a request for dispatch.
Testing the Carbon Monoxide Detector
Press the Test/Mute button on the front of the Carbon Monoxide Detector for no longer than 1 second. The device will chirp loudly for several seconds - so be sure to protect your ears while testing!
The Base Station will announce, “Carbon Monoxide Detector” to confirm the test was successful.
Once you are done testing the Carbon Monoxide Detector, press the left arrow key on the Keypad’s screen to exit Test Mode.
Note: If the Carbon Monoxide Detector detects particulate consistent with CO when your system is in Test Mode, the monitoring center will act as if it’s an emergency and respond accordingly for the alarm event.
Troubleshooting the Carbon Monoxide Detector
If you are having trouble testing your Carbon Monoxide Detector, the first thing we’d recommend is ensuring that you are only pressing the test button for no more than 1 second. If you press it for longer than that, it could cancel the test or cause the Base Station to not respond audibly.
As a next step, you’ll want to confirm that the Carbon Monoxide Detector battery is functioning. The CO Detector takes three (3) Energizer AA "UItimate Lithium" 1.5V batteries and has a life expectancy of 3-5 years depending on placement and usage.
Finally, you’ll want to ensure that your Base Station is centrally located within your home or business, and free from any neighboring wireless devices. We recommend having the Base Station elevated at least 3 feet off the ground on a non-dense surface (ideally glass or wood). We also recommend avoiding placing the Base Station within a cabinet or enclosed structure - as this can weaken the signal of it to other devices.
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CO Detector
