1、Automatic Identification Function: Lithium battery, water battery and dry battery are not distinguished, which can automatically identify, and the diameter of handlebar is 2.3cm / 0.9in. 2、Wide Compatibility: Does not distinguish all types of electric vehicles, general 12V‑99V electric vehicles. 3、Commonly Used Wiring Method: The red line is shifter positive 5V, the black line is the negative pole, please be sure to compare the function wiring of the controller, not simply connect the controller wiring according to color, once the wrong connection will cause damage to the controller or handle. 4、Manufacturing Material: Made of high quality plastic material, it is strong and durable, which undoubtedly extends its service life. 5、Ergonomic Design: The handlebar is ergonomically designed for slip resistance and comfortable grip, and the speed can be easily adjusted during use. Item Type: Electric Bicycle Throttle Grip Kit Weight: Approx.113g / 4.0oz Product Material: Plastic Efficiency: ≥98% Hall Grade: Linear HallHandlebar Diameter: Approx.2.3cm / 0.9in 1 x Thumb Locks 2 x Key