Reddit reviews 4Pack RC Lipo Battery Tester Monitor Low Voltage Buzzer Alarm Voltage Checker w/LED Indicator for 2-8s Lipo Life LiMn Li-ion Battery

When the Voltage is Below the Set Value,It Will Buzzer with Red LED Light,Pre-set Value 3.3V.Push Key which Can Change the Voltage Settings and Save4PCS 1-8s Lipo Battery Voltage Tester, Low Voltage Alarm Mode for 2-8S, Function of Checking Your Lipo Cells VoltageVoltage Display Function and Low Voltage Alarm Funtion(Note:When the voltage is lower than the alarm value, it will always ring.And when the product of the measured is unpluged, the alarm will stop.)Super loud alarm that sound makes it easier to find your drone.Display Mode: Battery cell voltages, total voltages, lowest cell voltage, Remaining battery capacity.