Describe: *The amount of remaining power can be accurately determined by rotating the real-time voltage value. *To avoid driving without electricity and accurate judgment of lithium batteries. *The quality of the judge's lithium battery can be accurately determined by rotating the real-time voltage value. * Automatically identify the voltage of the electric vehicle, below 100V, supports 36V or 48V, 60V, 72V and real-time display. * Used for electric bikes, scooters, tricycles and other electric cars. *Upgraded model supports 3-speed speed adjustment * Larger screen displays can show more information, including mileage, speed, power supply and voltage. Specification: Material: ABS + Rubber Color: Black Cable length: 1.7 million (approximately) Connection type: 6 pin, 8 pin (only 8 pin supports 3 gear adjustable speed) Used for: electric scooters, bicycles, motorcycles, tricycles, and. A Hall sensor is required to match the speed. Brown: Hall Speed ​​Line Dark Blue: High Speed Light blue: low speed White: Power + Yellow: Electric door lock Red: 5V power supply Green: Signal line Black: GND 1. Press and hold "M" to turn on the power and wait for P00 to display to release the power. 2. Click "M" to switch the adjustment options, main menu: P00-P09. 3. After selecting the corresponding option, press and press to enter the next step. (For example: long press P00 to input voltage option: click the M button to select voltage, then press M long press M button to select, restart the LCD for use Package includes: 1pcs bicycle handlebar with monitor