1、Universal: Regardless of various models of electric bikes (12V to 99V universal), they can be automatically identified and displayed in real time. 2、Real Time Display: Real time digital voltage display, intuitive, convenient, can accurately determine the remaining power, driving range. 3、Function: The display accurately determines the battery power according to the voltage and indicates the vehicle condition, and indicates the vehicle fault according to the voltage. 4、Strong Compatibility: This electric bike handlebar is compatible with acid batteries, lithium batteries, water batteries, dry batteries, regardless. 5、Installation Note: The green line is the hall signal line of throttle, the red line is the positive 5V, the black line is the negative pole, the blue line is connected to the exit line of the controller electric door, and the yellow line is connected to the positive pole of the controller electric door incoming line (power switch, control the power supply of the bike). Please be sure to check the controller's function line wiring, can not simply and the controller to the color wiring, once the wrong connection will cause damage to the controller or the handle.