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, preventing communication. Possible causes include existing issues with the vehicle's original condition, such as malfunction or short circuit in one of the components (booster, rotary knob, or motor). This may prevent the controller from detecting the fault and lead to failure in communication between the instrument panel and controller. Color: Black Material: ABS Package Contents: 1 x Electric Bike LCD Display Meter Note: The package includes only the items listed above; other products are not included. Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement error allowance: +/- 1-3 cm.