YKS 2 in 1 RC 1-8s Lipo/Li-ion/LiMn/Li-Fe Battery Checker with Low Voltage Buzzer Alarm and LED Indicator High quality, safe and durable. Test the working state of lithium battery. Compatibility: 1-8s Lipo/Li-ion/LiMn/Li-Fe battery. Easy to use: Just plug into the balance plug, the LED will cycle through the individual cell voltages as well as list the total voltage. Display Mode: Battery cell voltages, total voltages, lowest cell voltage, Remaining battery capacity.