Wireless 27-Function Bicycle Computer Speedometer 1. Luminous LCD screen 2. 27 Functions & 4 Features 3. Odometer/CLOCK/Trip Distance/ Elapsed Time, Current / Average / Max Speed, Min/Max Tem ,etc. 4. Super Waterproof Shockproof: Sophisticated techonology, interfaces seamlessly 5. Wiress Data Transmission, no USB cable needed