Andoer Original RC Li-ion Lipo Battery Tester Low Voltage Buzzer Alarm Warning Vistapower 1-8S Digital Display Indicator Original Vistapower 1-8S Digital Display Indicator RC Li-ion Lipo Battery Tester Low Voltage Buzzer Alarm Function of checking your lipo cells voltage. Voltage display function and low voltage alarm funtion. Use for 1-8s Lipo/Li-ion/LiMn/Li-Fe. Protect the battery from overcharging or overdischarging