The cycle computer is designed with solar powered function, provide additional power plus two batteries ensure longer time cycling Wireless design of this bike computer gives you easier and more convenient cycling, never worried about the complex in install the wires on your handlebars, waterproof design can resist any bad conditions weather, BUT don't put in the rainstorm or stay in the water This multifunctional bicycle computer features tracking speed and distance instead of cellphone knowing your cycling status while the green backlight design provides a clear view. Fit most bikes: road racing, mountain biking, cruiser bike, BMX, kids, fat bike etc. MODE and SET buttons on the bottom for easy operation. Sensitive sensor with magnet can track cycling speed accurately Built-in auto on/off function. Go into sleep mode with LCD displays after no operating, automatic wake up when cycling. Low power indicator to remind you to change battery while data won't be lost Specifications: Material: ABS Application: MTB Road Bike Waterproof: Daily waterproof Model: Wireless Installation position: Handlebar Item size: 60 * 50 * 13mm / 2.4 * 2.0 * 0.5in Item weight: 31.6g / 1.1ounce