feature: Lithium-ion lithium battery power indicator This is specifically designed for Li-ion and Li-polymer batteries; it cannot be used with LiFePO4 or LTO batteries. Size: 2.7*62*15.8MM Tap the red button to display the battery capacity/voltage When in use, it consumes about 30mA, and when it is off, there is no power consumption. energy level: L2: 9V-11V L3: 11V-11.5V L4: 11.5V-12V L5: 12V-12.6 Size: 2.7*62*15.8MM Cable length: 140MM operate: When charging or discharging, please use your fingers to lightly press the red button for processing. When the LED is on, the line current of the light board is about 30mA. Release your finger, the LED light will go off, the light board wire will be broken, and no current will flow. The board has reverse connection function, there is no problem connecting the wrong wire, adjust it A total of 5 small lights, display power, suitable for inverter lithium battery power prompt Package includes: 1*battery indicator Lithium-ion lithium battery power indicator This is specifically designed for Li-ion and Li-polymer batteries; it cannot be used with LiFePO4 or LTO batteries. Size: 2.7*62*15.8MM Tap the red button to display the battery capacity/voltage When in use, it consumes about 30mA, and when it is off, there is no power consumption.