Environmentally friendly ABS material, waterproof and sun-proof. Adhesive backing, installs in seconds. Easy installation. Double-sided adhesive tape is not easy to fall off, so choose a good installation location. High precision. High-precision movement, daily error of 0-3 seconds. Small and exquisite, with a diameter of only 2.8 cm and a thickness of only 1 cm (Note: Car electronic clocks are mainly suitable for motorcycle and electric vehicle dashboards because the field of view is relatively close, but try not to take up too much instrument space, intentionally) Highly waterproof. The overall waterproof mold design prevents rainwater from entering the watch core. Note: The data are all measured manually, please allow 1-3cm error, due to differences in light and display, there may be some color differences, please refer to the actual item received.