This is a kind of fine quality bike odometer, with 2.36-inch large screen can measures temperature and speed. Easy to read LCD display with large screen, also has backlight, you can see the data clearly. Easy to control, and easy to install firmly with mounting accessories. Perfect to use when hiking, climbing, riding and other outdoor actives. You can have a try. Specifications: Material: ABS Color: Black, White (Optional) Base type: Ordinary Base Type(Type A), Ordinary ' Extension Base Type(Tpye B) (Optional) Battery: 2 * CR2032 Button Battery, 3.0V 240mAh (included) Speedometer Size: 75 * 45mm / 3.0 * 1.8in Package size: 135 * 73 * 45mm / 5.3 * 2.9 * 1.8in Package weight:   Type A: 103g / 3.6ounce   Type B: 119g / 4.2ounce Packing List: Type A:   1 x Bike Computer(Battery Included)   1 x Speed Sensor   1 x Magnet   1 x Base Silicone Pad   1 x Base   1 x Sensor Rubber Pad   4 x Tie Band   1 x Instruction Manual Type B:   1 x Bike Computer(Battery Included)   1 x Speed Sensor   1 x Magnet   1 x Base Silicone Pad   1 x Base   1 x Extension Bracket   1 x Sensor Rubber Pad   4 x Tie Band   1 x Instruction Manual