Wireless panic buttons with 5 basic functions: System connection, panic function and 2 programmable buttons to switch on or off lights, X10 device control or other functions defined by the system. 868 Mhz (GEN2) Frequency. Outdoor range: 150m. Power supply with 12Vcc alkaline battery, 3 years duration. Dimensions: 57 x 36 x 10 mm.