Operating voltage: the DC of battery capacity monitor gauge indicators is 8-63V, you can adjust it to 12V, 24V, 36V, 48V according to the battery voltage Digital display: our battery indicator contains a clear blue display with bright light, allowing you easily see the battery level and battery capacity percentage on the display screen from different angles Applicable batteries: the battery capacity monitor gauge indicators are compatible with 12V 24V 36V 48V lead-acid batteries, ternary lithium battery, polymer lithium-ion battery, 3 - lithium ion battery, storage battery, water battery and so on Widely applicable: these battery indicators are suitable for golf cart, power bank, electromobile, car, vehicle, motorcycle, etc., practical and will meet your different needs easily Easy to use: please power off the unit, press the only button on the thing, and power it, continue to press the button reach the correct settings for your battery, power off the unit, and power on the unit, then done These are the different settings: Lead-acid batteries: 1P = 12V, 2P = 24V, 3P = 36V, 4P = 48V Lithium-ion batteries: 3c = 3 cells, 4c = 4 cells, etc. Iron-lithium batteries: 1F=1 cell, 2F= 2 cells, 3F= 3 cells, etc. 5. When correct code is displayed and turn off the power. 6. Turn on the power. The meter will now display the correct battery level. Specifications: Working voltage: min 8V, max 63V Working dissipation: 8 mA, Max 10 mA Sleep dissipation: 15 Temperature range: 0 - 35 Backlight on current: 40 mA, max 50 mA Backlight off current: 30 mA, max 40 mA Size: 60 x 23 x 15 mm/ 2.34 x 1.0 x 0.6 inch Colour: Black Material: Plastic Package Contents: 2 x Battery meter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.