Exact model-family answer directory
SimpliSafe Glassbreak Sensor troubleshooting
SimpliSafe Glassbreak Sensor (Glassbreak Sensor, identified by its serial number inside the battery compartment rather than a separate model number): range and battery (from SimpliSafe Support and Amazon); test Mode (from SimpliSafe Support); if it does not announce, and a fix for each symptom below.
Confirm the model first
Which units this covers, and how to tell yours is one of them
- Model numbers and patterns
- Glassbreak Sensor, identified by its serial number inside the battery compartment rather than a separate model number
- Not applicable to this hardware
- This SimpliSafe Glassbreak Sensor does not have the hardware for: will not stay connected to Wi-Fi; does not respond to voice control; will not connect through Matter, HomeKit or another platform.
Published specification
What is true of this model and changes how you fix it
- How it detectsAcoustically — it listens for the distinct sound of glass shattering, at up to 20 ft. It is not a vibration or contact sensor, so it does not need to be on the window itself.
- A hard limitSimpliSafe states plainly that the Glassbreak Sensor was designed for standard glass and WILL NOT detect breaking tempered, laminated or shatterproof glass. Those break with a different acoustic signature. On a home with laminated or toughened glazing this sensor does not do the job it was bought for, and no setting changes that.
- BatteryOne CR123A 3V Lithium cell, included, with up to 3 years of life depending on usage. Note CR123A — not the CR-2032 coin cell used by the Entry, Water and Temperature sensors, and a shorter rated life than any of them.
- Size2.5 x 2.5 x 1.25 inches, peel-and-stick installation.
- Range and battery (from SimpliSafe Support and Amazon)Listens for the sound of shattering glass within about 20 feet. One Duracell CR-123A lithium 3 V, with a life expectancy of up to 3 years.
- Test Mode (from SimpliSafe Support)Disarm with OFF on the keypad, press Menu, enter the Master PIN, scroll to Test Mode and use the right arrow. Press the button on top of the sensor, which lowers its sensitivity so a hand clap triggers it, walk to the window and clap once. The Base Station announces "Glassbreak Sensor" when it works. Try the clap from several spots to find the best mounting position.
- If it does not announceFirst confirm you can hear the Base Station from where you are testing (volume is under Base Station Settings, Voice Prompts), then check the battery, then the Base Station location and radio interference.
- Monitoring callWith monitoring, Test Mode brings an automated confirmation call. If you do not answer it leaves a voicemail and does not request a dispatch.
Where these figures were read. simplisafe.com/glassbreak-sensor Features list
Manufacturer support for this product line. SimpliSafe Support — Glassbreak Sensor Installation Guide. SimpliSafe's own Glassbreak Sensor placement and range article.
Also read for this model. SimpliSafe Support — Testing the Glassbreak Sensor; SimpliSafe Support — Glassbreak Sensor offline.
Exact questions
Questions that only have an answer for the SimpliSafe Glassbreak Sensor
Will the Glassbreak Sensor detect my windows breaking?+
Only if they are standard glass. SimpliSafe states explicitly that it will not detect breaking tempered, laminated or shatterproof glass, because those break with a different acoustic signature. If your glazing is toughened or laminated — common in doors, conservatories and newer builds — this sensor cannot do what it was bought for.
How close does it need to be to the window?+
Within 20 ft, per SimpliSafe's specification. It listens for the sound rather than sensing the glass, so it does not go on the window itself — one sensor can cover several windows in the same room if all of them are inside that radius.
What battery does it take?+
One CR123A 3V Lithium cell, rated up to 3 years. That is a different cell from the CR-2032 used by the Entry, Water and Temperature sensors, and a shorter rated life — worth knowing before you buy a pack of the wrong thing.
Why does it have a shorter battery life than my other sensors?+
It is doing more work. An acoustic sensor listens continuously, where a magnetic contact sensor only reports when it changes state. SimpliSafe rates this one at up to 3 years against up to 5 for the contact sensors, and that is the reason.