Features: 3 in 1 design integrates the functions of bike speedometer, bicycle front light, and electronic horn. Measures current speed, average speed, maximum speed, trip distance, trip time, and total distance. Additional functions include speed tendency, speed comparator, temperature, stopwatch, calories burned, fat burned, estimated arrival time, and auto scan. User-selectable 12h/24h clock format, KM/M units, auto sleep, and auto wake-up modes. 2.2-inch large LCD screen provides clear visibility of riding data during day and night. Super bright LED headlight with multiple modes: speedometer backlight, low beam, high beam, and SOS, enhancing visibility and safety during nighttime rides. Electronic horn delivers a loud alert to warn pedestrians and other riders. Built-in rechargeable battery can be charged via any USB-powered device such as a power bank, computer, laptop, or wall charger. Specifications: Material: ABS + Acrylic Backlight Color: Green / White (optional) Computer Battery: 3.7V 1200mAh Sensor Battery: CR2032 Distance Between Sensor and Magnet: <3mm Dimensions: 100 x 53 x 27mm / 3.9 x 2.1 x 1.1in Weight: 91g / 3.2oz Package Size: 127 x 75 x 62mm / 5 x 3 x 2.4in Package Weight: 212g / 7.5oz Package List: 1 x Bike Computer 1 x Sensor 1 x Magnet 1 x Handlebar Base Bracket 1 x Base Bracket Silicone Pad 1 x Sensor Silicone Strap 1.5mm 1 x Mainframe Base Silicone Strap 2.5mm 1 x Extension Bracket 1 x Sensor Silicone Pad 1 x Extension Bracket Rubber Pad 1 x Remote Control Button 1 x Type C Charging Cable 1 x User Manual