100% plastic Backlight: The unique design of the bicycle stopwatch with its own night light display, green and white distinguish between day and night. You can easily turn on the light by pressing a button. It can only be kept for a few seconds, if you still need to turn on the night light, just press it again. Allows you to easily read the data while riding. WATERPROOF : This advance cycling computer is designed with backlight for night riding and waterproof against raining and wet condition. Works anytime and any weather! High cost performance: The bicycle computer adopts a unique style design, and the built-in night light display allows you to read the data clearly while riding at night. Moreover, it is small in size, light in weight, waterproof and durable, and extremely cost-effective. DATA STORAGE TRANSMISSION: The digital transmission mode of the bicycle computer code meter allows you to quickly confirm or transfer data without any interference at any time and any place.