Description 100% brand new and high quality Product Name: Bicycle Speedometer Odometer Color: black Material: plastic Scope of application: bicycle Size: 60*45*20mm(2.36*1.77*0.78inch) Quantity:1 set Features: [EASY TO INSTALL]The attached base can firmly lock this computer onto the slot and prevent falls and drops in bumpy road, Install the sensor on the front brake,magnet is installed on spoke, 4mm close to the sensor.Battery can be replaced, easy to open the battery case with a coin to help, coin not included [MULTI FUNCTIONS] - Auto sleep/wake, display the current speed, max speed, average speed, total distance, trip distance, riding time, stopwatch, calorie consumption, temperature, and clock. [WIDE APPLICATION]Our bike computer only takes a few minutes to install. customizable to most common tire sizes for accurate stats tracking. small size, lightweight and wireless design make it suitable for most types of bicycles: road bicycles, mountain bikes, folding bicycles, common bicycles, pit bikes, etc. [WIDE APPLICATION]Our bike computer only takes a few minutes to install. customizable to most common tire sizes for accurate stats tracking. small size, lightweight and wireless design make it suitable for most types of bicycles: road bicycles, mountain bikes, folding bicycles, common bicycles, pit bikes, etc. [WATERPROOF]Small size, lightweight, easy to transport and install. The waterproof design makes it more comfortable and durable even, You can still enjoy your cycling travel on a rainy day. Note: 1. As we all know ,the different computers display colors differently,the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size ,you can feel free to