1. The digital battery monitor is suitable for 7-100V (12v 24v 36v 48v 60v 72v 84v) LiFeO4 battery, lead acid battery, battery, ternary lithium ion battery, NiMH battery, 18650 power battery. 2. Whether it is motorcycle, two-wheel electric vehicle, three-wheel electric vehicle, car, supercar, as long as it is equipped with battery, it can measure the percentage of residual voltage. 3. The battery monitor not waterproof and it only be used for indoor. 4. The red wire is positive and the black wire is negative. 5. with Buzzer Alarm and Temperature Display --- The battery monitor can set high and low voltage buzzer alarm, short "M" key to switch voltage and temperature (Celsius). 6. with power-off memory function. Supported battery types: 1. L ternary lithium battery, measuring range from L03 string to L20 string. with power-off memory function 2. P. Lead-acid battery, measuring range from DC 12V to 24V, 36V, 48V, 60V, 72V. 3. F. LiFePO4 battery, measuring range from F04 to F24 series, with power-off memory function 4. Custom settings: If the battery type is not the above 3, please customize the settings. Parameters: Voltage range: DC7-100V Working current: Less than 10mA Voltage accuracy: 0.1V (0.1% - 0.5%) Display mode: LCD screen Measurement accuracy: 0.5% Measurement speed: 2 times per second Colour:black Material:plastic Size:64 x 36 x 15.3mm Package Contents: 2 x battery tester Only the above package content, other products are not included. Note: Light reflection 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.