Fox Mini Micron X Bite Alarm, A modern re-worked version of the old school classic Mini Micron Bite Alarm boasting a number of great new features including receiver technology. LEDs adjusted by holding down volume button and pressing tone button D-Tec Sensing System/Roller wheel technology for clear, consistent bite detection Power out socket 2.5mm for use with illuminated bite indicators such as the Fox Illuminated Swinger. Batteries are too low when the LEDs automatically begin to flash red every 2 seconds.