IGPSPORT ANT+ GPS Bike Computer IGS618E Bluetooth Speedometer Wireless Waterproof Bicycle Digital Stopwatch Cycling AccessoriesBrand Name: iGPSPORT Stopwatch and Accessories: Waterproof Stopwatch Model Number: IGS618E Suitable For: Touring Bicycle Road Bike MTB bmx Color: Black Name: IGPSPORT ANT+ GPS IGS618 Bike Computer Speedmeter GPS: High Sensitive GPS+Beidou+Glonass Feature: Bluetooth Wireless Backlight Physical Dimension: 85*53. 5*18. 8mm Waterproof, Interface: IPX7, Micro USB Memory: About 3000 hours data storage (typica usage) Battery: About 22 hours (typical usage)