With this bicycle computer, every cycling data is under control. Specifications: Material: ABS + PMMA Shell Color: Black / White ( optional ) Backlight: Blue / Green / White ( optional ) Screen Size: 60 * 45 mm / 2.4 * 1.8 in Product Size: 80 * 54.5 mm / 3.1 * 2.1 in Product Weight: 65 g / 2.3 oz Packing Size: 13 * 8 *4.4 cm / 5.1 * 3.1 * 1.7 in Packing Weight: 150 g / 5.3 oz Package List: 1 * Bike Computer 1 * Extension Bracket 1 * Nut 1 * Base 1 * Transmitter 1 * Magnetic Screw 4 * Zip Ties 1 * Rubber Pad 2 * Manual Small size ,lightweight and wireless design make it more convenient and easier to install and use. 2.8-inch high-definition large screen with LCD backlight allows you to read the data clearly at any time and any angle. High quality smart chip, stable performance and large memory capacity, thus the data will not lost when power is off. Real time recording, current speed, max speed, average speed, distance, total distance, temperature, calorie, stop watch. IPX6 grade waterproof, it can be used on rainy days.