Features: Compact appearance design, multi-function stopwatch is economical and practical. Waterproof protection. Immerse in the water for a short time, it is fine in light rain or heavy rain, but it is not recommended to rain for a long time, so as to prevent water from causing accidents. Not only Measuring and display current speed, average speed, maximum speed, also display the compare of current and average speed. If there is a traffic signal input or press any key, it can revert to the shutdown mode and memorize the data before shutdown. Bike Computer Waterproof Wired Multifunctional Bicycle LCD Computer Speedometer Cycling Odometer Stopwatch. It can display 14 kinds of functions (driving speed, total mileage, single driving mileage, maximum driving speed, average speed, average speed, driving time, clock, automatic cycle function, comparison prompt, kilometer or mile setting, tire circumference setting, total mileage initial value setting, driving data sampling function, on / off, maintenance reminder function) Specifications: Color: Black Material: Plastic Battery: CR2025(Include) Item Size: 44*49*15mm Package Weight: 65g Packing List: 1xComputer 1xTies 1xWired Sensor 1xUser Manual