Specifications: The bicycle speedometer is featured with a LCD digital display so it can provide the correct riding speed. It could monitor your bike speed, distance and riding time. Also it's waterproof which makes it suitable for both sunny days or rainy days. It is perfect when you are riding a bike. Item Name: Bike Odometer Material: ABS Battery: 1 x AG10 Battery (Included) Features: Waterproof, Durable, Cycling Data Monitor Size: 5cm x 4.5cm x 1.5cm/1.97" x 1.77" x 0.59" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bicycle Odometer 1 x Base with Wired Sensor 1 x Magnet 6 x Tie Straps 1 x AG10 Battery 1 x User Manual