Sonik Herox Bite Alarms 3+1+BL Bite alarms: Two highly visible 5 mm LEDs, eight sensitivity levels, forward and reverse drop-down display, eight volume and tone settings, 2.5 mm power jack, Nightglow LED function, up to 150 m range, silent low battery warning, 2 x AAA batteries (not included). Receiver specifications: four channels, red-green-blue-orange LEDs, registration of up to four alarms per channel, eight volume levels including silent mode, fallback indicator and torch function, vibration mode, silent low battery warning, operates on 3 x AAA batteries (not included). Bivvy Light: manual on/off or automatic illumination when the alarm is triggered, six colour channels (red, green, blue, yellow, purple, white), 3 x AAA batteries required (not included).