Speed and distance measurement- On the device not only show Max./durchschn./akt. Speed, but also distance and time data which can be used to adjust driving or training plan. Wireless] - Made with high quality wireless technology, the tachometer of motorcycle provides stable wireless transmission, ensuring the accuracy of riding data. (These parts should be used in the appropriate position: the distance between the sensor and the magnet is 3mm, and the distance between the sensor and the bicycle computer is less than 60cm.) Multi-function and easy to use- Stopwatch, timer, automatic alarm clock, KMH/MPH switch... All these functions can be realized with only 2 buttons. Backlight- For use at night, the EIVOTOR bike computer has a green LED backlight. By simply pressing the "SET" and "MODE" buttons, you can simply turn on / off the light. Splash proof- Waterproof design. With splash protection, it is able to work in light rain. As the English manual is universal (wired version and wireless version), our product is a wireless meter, so our accessories do not include a wired computer sensor