HobbyKing

Signal loss Alarm & Lost Plane Finder, simple device that plugs into any servo/rx port, will detect the loss of TX signal and emit a loud 85dB alarm. Ideal for warning you if you have not turned off your RX power supply while in the pits, or if you are having trouble finding a model in the long grass, simply turn off your TX and within a minute, the alarm will sound! Specs:Weight: 4.5gOperating Voltage: 4v~6vCurrent Drain: 1~35mAh