This is a multi-functional cycling meter, which can record and display cycling speed in real time, can measure temperature, display total mileage, and so on. And the installation is simple. Features: 2in clear screen display, more convenient data viewing. Support five languages (Chinese, English, German, French, Spanish), wider applicability. 90 days of working time, half a year of standby time. Multi-function: display time, temperature, speed, average speed, maximum speed, total mileage and cycling time. With 7 days memory function and stopwatch function. Full-screen backlight, barrier-free data observation at night. Daily waterproof, not afraid to ride in rainy days. Quick and convenient installation. After three minutes of standing in the code, automatically enter the dormant state, and automatically enter the working state when the bicycle starts. The riding data is comprehensive, and the displayed page can be freely selected. Specifications: Type: wired, wireless (optional) Main color: black Material: ABS+metal Mileometer battery: CR2032, 3V, 240mAh Wired sensor battery: CR2032, 3V, 240mAh Waterproof: IPX6 Screen size: 31 * 41mm / 1.2 * 1.6in Mileometer size: 63 * 39 * 14mm / 2.5 * 1.5 * 0.6in Mileometer weight: 30g / 1.1ounce Package size: 120 * 80 * 45mm / 4.7 * 3.1 * 1.8in Package weight: 90g / 3.2ounce Packing List: Wired Type: 1 * Mileometer 1 * RubberRing 1 * Wired Sensor with Base 1 * Magnet 2 * Sponge Gaskets 4 * Fixing Cable Wireless Type: 1 * Mileometer 1 * RubberRing 1 * Sensor 1 * Magnet 2 * Sponge Gaskets 4 * Fixing Cable 1 * Mileometer Base