2-4s 7.4v 11v RC Lipo Battery Low Voltage Alarm Buzzer
RC Lipo battery low voltage buzzer alarm * This micro device can measure lipo from 7.4v to 11.1v (2s to 4s) * it will sound up to 95dB if your lipo cell voltage drop to 3.3v * It is also a good device for quick test for your lipo before flight * it can use as inflight alarm if you not sure the maximum flight time.