If a burglar breaks a window in order to enter your home, this Glassbreak sensor will detect the sound and trigger your burglar alarm. Pair it with a motion detector in any rooms on the first floor that have multiple windows. Note: This product only works with SimpliSafe packages like the 10 piece DIY Home Security Kit. Policies & plans Act fast against burglaries with this SimpliSafe glass break sensor. It triggers an alarm if it detects the sound of shattering glass within its 20-foot range, providing reliable security even when no motion detector is used. This SimpliSafe glass break sensor utilizes detection algorithm and digital signal processing technologies for accurate sound recognition. Precise sound detection Tell the difference between an intruder smashing a window and a plate breaking to trigger your burglar alarm when it is necessary. Ready to work right out the box With pre-installed battery for long-lasting use. Simple installation Place it in the room you want to monitor and easy to add to your SimpliSafe system.