Wireless vibration detector, reacts when the window/door is shaken. Can also be set as a tilt sensor, for use with safes, works of art, etc. Sensitivity adjustable. Includes tamper switch. Delayed alarm (immediate alarm adjustable via software). Frequency: 868 MHz. Power supply: 1x 3V CR123A lithium battery (included). Color: white. Dimensions: 30 x 75 x 27mm.