used to arm part arm disarm alarm system frequency 868mhz wireless range 150m personal attack pa switch operates on all arm delay arm for siren alarm systems home arm for keypad alarm systems and disarm functions low battery indicator fitted with battery and battery isolation tab power supply 1 x 3v cr2032 lithium battery battery life 2 years black activate and deactivate your alarm system with one touch the hs3fob1s wireless remote control keyfob incorpo