Product size about : 51*42*18mm / 2*1.7*0.7in Product color: As shown in the figure Product material: abs Weight: 56g product features: Small in size and light in weight, wired and waterproof design make it convenient and Sturdy. Multi-functions: the computer measures average speed, maximum speed, distance and riding time etc, to keep track of your Cycle effectively. 300 seconds without signal input, screen display will enter standby mode, clock retention. If there is a traffic signal input or press any key, it can revert to the shutdown mode and memorize the data before shutdown. Powered by a LR1130 button battery (note: the battery is included). ​Precautions: 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 contact us at any time. We will give you some suggestions, but for your reference only. Shipment includes: 1 * Computer 1 * Mounting Base 1 * Wired Sensor 1 * Magnet 6 * Ties 1 * User Manual