The product shell is made of ABS and metal components, with a liquid crystal display screen. Applicable handlebar size: 22.2mm. IP65 rated. After connecting the instrument, if the interface displays P3C, this indicates a communication protocol mismatch between the instrument and controller, resulting in no communication. If the original condition of the vehicle is in poor state and one of the three components—booster, rotary knob, or motor—fails with a short circuit, the controller may not detect the fault and could stop working, leading to communication failure between the instrument panel and controller. Color: Black Material: ABS Package Contents: 1 x Electric Bike LCD Display Meter Only the above package content is included; other products are not included. Note: Light reflection and differences in display screens may cause slight variations in the color of the item as shown in the picture compared to the actual product. Measurement error allowance is +/- 1-3cm.