Capacity Indicator LED for 3S Lithium Battery is an intelligent percent power level LED indicator board, that help you keep your batteries in good condition; slightly push the trigger switch, and it will auto power off after 3 seconds of the display.
25% –>First Light is on (Voltage: 3.1 V)
50% –>Second light is on (Voltage: 6.3 V)
75% –>Third light is on (Voltage: 9.4 V)
100% –>Fourth light is on (Voltage:12.6 V)