Features: 3 in 1 design integrates the functions of bike speedometer, bicycle front light and electronic horn. Measures your current speed, average speed, maximum speed, trip distance, trip time, total distance. More functions: speed tendency, speed comparator, temperature, stopwatch, calories, fat burned, estimated arrival time, auto scan. User selectable 12h / 24h clock, KM/M unit, /, auto sleep/auto wake up. 2.2" large LCD screen makes it easy to glance the riding data in the day and night. Super bright LED headlight with adjustable modes: speedometer backlight, low light, high light, SOS, providing good visibility and keeping you safe when riding at night. Electronic horn is loud enough to be heard and warn the pedestrians, riders or riders. Built-in battery makes it easily recharged from any device with a USB port, such as power bank, computer, laptop, wall charger, etc. Specifications: Material: ABS + Acrylic Backlight Color: Green / White (optional) Computer Battery: 3.7V 1200mAh Sensor Battery: CR2032 Distance Between Sensor and Magnet: