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The Smartwares SMA-40952 Glass Break Sensor Alarm notifies you if the glass in your window breaks. The alarms detect vibrations and broken glass, which triggers the alarm with a 90 dB sound. The alarms can be turned on and off using the on/off function, which is located on the side of the product. They are easy to install with self-adhesive tape and the included batteries. The package contains two alarms, so you can secure multiple windows at the same time. Information Brand: Smartwares Type: Alarm Model: SMA-40952 Color: White Sound: 90 dB Batteries: are included Contents 2 x Sensor alarms, batteries & user manual