Features: 1Real Time Display: Real time digital voltage display, intuitive and convenient, can accurately judge the remaining power and mileage. Regardless of lithium batteries, water batteries, dry batteries. 2Function: The display accurately judges the battery level according to the voltage and indicates the vehicle condition. Intuitively and accurately judge the remaining city and mileage, and indicate the vehicle fault according to the voltage. 3Automatic Identification: Regardless of various models of electric vehicles (12V to 99V universal), they can be automatically identified. The power switch controls the power supply of the vehicle. 4Connection Wire: The green wire is the signal wire of the turning handle, the red wire is the positive 5V of the turning handle, the black wire is the negative wire, the blue wire is connected to the outgoing wire of the controller switch, and the yellow wire is connected to the positive terminal of the incoming power supply of the controller switch. 5Warm Tip: Please be sure to check the wiring of the controller's function line, not simply the color of the controller and the wiring, once the wrong connection will cause damage to the controller or the handle. Package included: 1 x Throttle Grip 1 x&nbspHandle Sleeve 2 x Key