Features: 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. User selectable 12h / 24h clock, KM/M unit, /, auto sleep/auto wake up. LED screen with green backlight makes it easy to glance the riding data in the day and night. 2 smart buttons for easy operation. Small size, lightweight and wireless design makes it more convenient. Can be installed on the handlebar or stem. Specifications: Material: ABS + Acrylic Battery: CR2032 Size: 54 * 18mm / 2.1 * 7in Weight: 33g / 1.2oz Package Size: 140 * 70 * 45mm / 5.5 * 2.8 * 1.8in Package Weight: 89g / 3.1oz Package List: 1 * Bike Computer 1 * Sensor 1 * Base Bracket 1 * Base Bracket Silicone Pad 1 * Magnet 1 * Sensor Silicone Pad 1 * Sensor Fixing Strap 1 * Base Bracket Fixing Strap 1 * User Manual