Features: It provide 19 functions for cyclists and fitness enthusiasts, including measuring speed, distance, and cycling time. With 2 Buttons, easy operation. Solid and Strong, and Suitable for most Bike. Bicycles speedometers adopts a glarefree backlits screen, and by touchings the Modes key and the Set key at the same time, you can keep the backlights on. And can read data more easily and clearly. Our bike computer feature a IP54 waterproof function. It is used to bear rain and can used in any weather condition(Not put directly into water). Builted-in automatic open/closed function mean you not have to worry about wasting batteries power. The bike computer automatically enters sleepings modes after 5minutes of inactivity and resumes instantly with any button press or motion signal. Specifications: Material: ABS Size: about 6x4.5x2cm/2.36x1.77x0.79inch Package Includes: 1x Bike Odometers note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.