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