This is a necessary for cycling lovers. New Design--Solar Energy. Wireless and waterproof design makes the product more convenient and practical. No need to worry about installing wires on the handlebars, no need to worry about rain. Features: Wireless and waterproof design: Wireless and waterproof design makes the product more convenient and practical. No need to worry about installing wires on the handlebars, no need to worry about rain. New Design--Solar Energy: Use solar panels to automatically charge in the sun or light, provide extra power to the computer, and have 2 batteries built in to keep your normal power requirements. Environmental protection, extending battery life. 5 Language on LCD digital display: Support for five language systems: English, Deutsch, French, Espanol, Dutch. It's no longer a problem to deal with the unfamiliar language of the operation instructions. Multiple functions and wide application: Built-in multi functions, which can measure the speed, distance, riding time calorie counter and other serious cycling or fitness enthusiasts. Small size, light weight and wireless design make it suitable for most cycling. Daily and Night Backlighting: Provides backlight and large LCD display for easy viewing in the darkIn any MODE,hold [SET] +[MODE],shows the LIGHT ON or LIGHT OFF, when in LIGHT ON mode,press any key the backlight on 6 seconds, when in the LIGHT OFF mode,closing the backlight. Built-in auto on/off function: You don't have to worry about the battery wasting power.Your bike computer knows when you've stopped and automatically stops counting time and averaging speed. Low consumption and long endurance: With button cell battry , low consumption and long endurance Open the battery cover with a coin.Please remember to take out the insulation sheet in the code table and sensor when using. Specifications: Color: Black Battery: 2 * CR2032 button battery (included) Waterproof: Daily waterproof Installation position:Handlebar Display Five Languages (English, Deutsch, France, Dutch, Espanol) Transmitting distance:the max 800mm Size: 72 * 39 * 12mm / 2.8 * 1.5 * 0.5in Weight: 30g / 1.1ounce Package size: 150 * 100 * 50mm / 5.9 * 3.9 * 2.0in Package weight: 89g / 3.1ounce Package List: 1 * Host 1 * Sensor 1 * Bracket 1 * Speed Magnet 2 * Rubber Slice 4 * Plastics Strap 1 * O-ring 2 * CR2032 Button Battery