Fine quality wear-resistant tempered glass + practical ABS outer case with high strength, and long life service. Features: Easy to Install. Fine quality wear-resistant tempered glass + practical ABS outer case, with high strength, and long life service. Easy to read large LCD screen display, you could enjoy the digital easily and remotely. Automatically calculate your movement, with thermometer, night light, and wireless automatic wakeup function. Main function: Calorie expenditure calculation, temperature detection, night light, automatic wakeup function etc. Specification: Case material: ABS Color: black Display: LCD Battery: CR2032, 3.0V 240mAh(included) Size(not include the holder): 52 * 52 * 20mm / 2.0 * 2.0 * 0.8in Package size: 150 * 100 * 55mm / 5.9 * 3.9 * 2.2in Package weight: 144g / 5.1ounce Package includes: 1 * Bike Odometer(included battery)