Large LCD display provides easy reading of speed, distance and riding time at a glance. Multi-function and durable design: small size, lightweight, wireless and waterproof. It measures speed, distance and riding time, for serious cyclists and fitness enthusiasts who want accurate data. Day and night backlight: green and white color scheme helps distinguish day and night viewing. Note: a slight rattle from the device is normal due to the wireless automatic function. Fashionable design: compact and light, with multi-function capability. Functions as a bicycle speedometer and odometer, measuring speed, distance and riding time. Widely compatible: suitable for all bicycle types, including road, mountain, folding and standard bikes. Use scenarios: - Daily commuting or fitness rides on a road bike to monitor speed, distance and riding time. - Mountain biking on trails, where waterproof and wireless reliability are beneficial. - Training sessions or long tours on any bicycle to track progress and riding time.