Set of Vipex RS Bite alarms: 150 m range, 6 volume levels, 7 different sound types, 4 different sensitivity settings, night light function, visual & audible fall bite detection, battery voltage detection, anti-theft protection, robust, water-resistant housing, integrated snag bars. Requires 1 x 9 volt block battery (please order separately). Receiver: 150 m range, 4 different coloured LEDs, 6 volume levels, sound synchronisation with bite alarm, vibration alarm, 3 different alarm modes, can be optionally coupled with Camp Security, drop bite indicator, robust, water-resistant housing, anti-theft protection. Requires 1 x 9 volt block battery (please order separately).