Description: This item is made of quality material with fine process, it's lightweight, portable, durable, waterproof, resistant to high and low temperature. The screen is luminous and clearly display the time, speed, distance, etc. This item is perfect for riding lovers. Features: Made of premium material, lightweight, waterproof, sturdy and durable for long time use. Powered by one CR2032 battery, energy-saving deisgn can offer you a long working endurance. Large LCD dispaly supports bright backlight, can make you read readings clearly in both day and night, convenient to use. It's multifunctional, it can show you data of speed, distance, time, current temperature, etc. And it also supports A/B dual independent system, which means you can record two groups of data. The sensor is super sensitive and can work in wide range of harsh weathers and temperatures , and it has overspeed alert fucntion, which makes your cycling safer. Comes with necessary accessories, easy to install or disassemble, g ood accessory for riding lovers. Specification: Material: Plastic Color: Black Options: Wired; Wireless Backlight: Yes Waterproof: Yes Suitable for 4-40inch bikes Power Supply: 1 x CR2032 battery (included) Odometer Size: Approx. 5.5 x 4.6c m / 2.16 x 1.81inch Weight: Approx. 81-87g Package List: 1 x Bike Computer (battery included) 1 x Wired / Wireless Transmitter 1 x Bike Computer Holder Mount 1 x Magnetic Sensor 1 x Anti-shock Pad 4 x Straps 1 x User Manual Note: 1. This odometer is only rainproof! Don't dip it in water. 2. Please don't miss the waterproof sealing ring in the battery compartment. 3. Please keep the distance between magnetic senor and transmitter below 2mm.