Features: MULTI FUNCTIONS with AUTO SLEEP and WAKE-UP--Wireless bike computer records with average speed, maximum speed, current speed mph/kph, riding time, odometer, clock, distance, scan, maintenance alert. Curved square shape body, quick-respond press buttons, exact modes display, you have all cycling data easily by this cycling computer. The inner motion sensor will wake up the computer automatically when you start cycling; with no operation for minutes, it will enter sleep mode to save battery power. GREEN BACK-LIGHT AVAILABLE and EASY INSTALLATION--Press any buttons in night time 18:00-6:00, green back light will keep for 6 seconds automatically, making data clearly read at night. ACCURATE Distance Speed Tracking and Clear Large Display--As the wonderful pure wireless sign showed, it has stable wireless transmission that ensures accurate data of your cycling, keep the distance between the computer and the sensor less than 60cm to make them fully communicate. Large LCD display and numbers shows clearly and easy to read data, more safe and convenient while cycling. WATERPROOF and WIDE SUITABLE--With rubber ring and full-sealed body, this bicycle speedometer is waterproof and works great on rainy as usual when riding. Specifications: Material: engineering plastics, electronic components Display: LCD display Size: 56mm*41mm*20mm Weight: 15G Color:Black Power: 1 CR2032 button battery at the head; 1 CR2032 button battery for the transmitter Package Included: 1 x Bike Computer Notes: 1.Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. 2.Due to the manual measurement and different measurement methods, please allow 1-3cm deviation. Thanks