Large LCD display for easy reading of speed, distance, and riding time. Small size, lightweight, wireless and waterproof design for durable, convenient use on all rides. Measures speed, distance, and riding time, appealing to serious cyclists and fitness enthusiasts who want clear, actionable data. Day and night backlight with green and white colors to improve readability in varied lighting; note that a slight rattle from the device is normal due to the wireless automatic function. Multifunction device that serves as both bicycle speedometer and odometer, providing speed, distance, and riding time data. Wide compatibility: suitable for road bikes, mountain bikes, folding bikes, and standard bicycles. Use scenarios: Daily commute: monitor distance and riding time to track progress. Training rides: pace yourself with speed and duration data on road and mountain routes. Multibike use: easily transfer between bikes while keeping consistent metrics.