Working Range: Only support 12-84V batteries, such as 12V P01 lead acid batteries, P04 lead acid batteries, and please note this item does not support lead acid batteries 6V. Powered by tested circuit, no additional power source required. Key Setting: Function button toggles between capacitance, voltage and shutdown. Choose to display voltage, battery capacity percentage alone or alternately by pressing the function button. Adjustment knob can select battery specification etc.Easy to install:Built with buckle, no screw installation. Universal battery capacity meter, set up by yourself.LCD Display: The battery monitor is designed with high quality LCD display, provides clear and bright display from all angles. Automatically turn into sleep mode in 10 seconds to save power.Widely Used: The battery detector is suitable for lithium batteries and lead-acid batteries, such as ternary lithium batteries, polymer batteries, lithium-batteries. ion, storage batteries. Note: It cannot be used for Lithium Iron Phosphate batteries, 1-2 Li batteries in series and more than 15 Li batteries in series. Note: The data are all manual measurement, please allow 1 - 81cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.