Automatic Identification Function: Automatically identifies lithium battery, water battery, and dry battery without distinction; handlebar diameter is 2.3 cm / 0.9 in. Wide Compatibility: Compatible with most electric vehicles within the 12V–99V range. Wiring Method: Red wire connects to shifter positive 5V, black wire to negative terminal. Always verify controller function wiring before connection—do not rely solely on wire color to avoid damage. Material: Constructed from high-quality plastic for strength and durability, extending product lifespan. Ergonomic Design: Features an ergonomic grip design for slip resistance and comfortable handling, allowing smooth speed adjustment during use. Item Type: Electric Bicycle Throttle Grip Kit Weight: Approx. 113g / 4.0oz Product Material: Plastic Efficiency: ≥98% Hall Grade: Linear Hall Handlebar Diameter: Approx. 2.3cm / 0.9in Package Contents: 1 x Thumb Throttle, 2 x Keys