This HomeSafe® Wireless Home Security Vibration Sensor is a double sensor that detects vibration and when your door/window has been opened.
It has a wireless radio frequency range of 300 feet. When triggered the RF signal activates the alarm. Uses one 9-volt battery (not included). Easily protect every window and door of your home.
Dimensions: 3 1/2″x2 1/4″x1″