The Qolsys IQGlass-S QS1431-840 Glass Break Sensor is a top-of-the-line device that ensures the safety and security of your home. With its advanced technology and 319.5MHz frequency, this glass break detector guarantees accurate detection and immediate alert in case of any intrusion. This device comes with a battery and is manufactured by Qolsys, a trusted brand in home security. The QS1431-840 model is specifically designed to detect the sound of breaking glass and can be easily integrated into your existing security system. With its sleek and compact design, it seamlessly blends into any home decor. Protect your home and loved ones with the Qolsys IQGlass-S QS1431-840 Glass Break Sensor.