Large LCD digital display for easy readability of speed, distance and riding time. Lightweight, compact, wireless and waterproof design for convenient and durable use. Measures speed, distance and riding time, ideal for serious cyclists and fitness enthusiasts who want clear data. Day and night backlight with green and white colors to distinguish between day and night use. Note: slight rattle sound from the device is normal due to the wireless automatic function. Fashionable compact styling; functions as a bicycle speedometer and odometer, tracking speed, distance and riding time. Wide compatibility: suitable for all types of bicycles including road bikes, mountain bikes, folding bikes and standard bicycles. Use scenarios: Daily commuting: monitor riding time and distance to meet daily goals. Road or mountain training: track speed and distance during workouts. Recreational rides on folding or city bikes: easily monitor time and distance while exploring.