Description: Material: ABS Size:49*44mm/1.9*1.7" Color:black -- The product has a total of 14 functions: driving speed/total mileage/single driving mileage/maximum driving speed/average speed/driving time/clock/automatic cycle function/comparison prompt/km and mile setting/tire circumference setting/total mileage Initial value setting/driving data sampling/on and off/maintenance function reminder. -- The product is waterproof, light rain or short-term heavy rain is not a big problem, but long-term rain is not recommended to avoid failure. -- Product assembly is quick and easy, and no tools are required. -- LCD screen for clear reading during cycling. 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 contact mewe will give you some suggestion,but it is for you reference only. 3.We could accept Mixed items,Colors And Sizes Order. The more quantities, the more Package include: 1 pcs* bicycle meter 1 pcs* strapping 1 pcs* magnet 1 pcs* wired sensor 1 pcs* base 1 pcs* manual