Yueton Rc 1-8s Lipo Battery Tester Monitor Low Voltage Buzzer Alarm Voltage Checker with LED Indicator for Lipo LiFe LiMn Li-ion Battery Use for 1-8s Lipo/Li-ion/LiMn/Li-Fe battery Test the working state of lithium battery. Low voltage alarm mode for 2-8S NOTE: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 save. Package Includes:1Pc*Lipo Battery Tester