Tweovnai Wide voltage input,reverse protection, percentage of , the voltage value of display, the voltage accuracy of 1% Technical Parameters: Operating current: Less than 5mA Operating voltage:12-84V Operating temperature: 0 Celsius-40 Celsius Display: capacity/voltage Backlight: Green Applicable battery type: Ternary Lithium battery, Polymer lithium- battery, Lithium battery, battery, Water battery, etc. Application: Various instruments and meters portable device bank device, electrombile, self-balance car. Install : With buckle, no screw needs supporting 30cm terminal wire, easy maintenance 1.It's a 2 in 1 tester. Can read the battery capacity and voltage. 2.Wide application battery type, fits battery 3.low consumption colour:black Material:Plastic, ABS size:Product dimensions(WxDxH):2.41x1.31x0.53 inch/61.3x33.3x13.5mm Drilling hole dimensions(WxD):2.3x1.12 inch/ 58.5x28.5mm Package Contents: 1 x battery meter indicator 1 x terminal wire Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.