IGPSPORT IGS50E ANT+ Bicycle Computer Speedometer Stopwatch IPX7 Waterproof ANT Bluetooth 4.0 GPS Bike Computer AccessoriesStopwatch and Accessories: Waterproof Stopwatch Model Number: IGS50 Brand Name: iGPSPORT Size: 53. 5*85. 8*22mm Color: 2 colors Weight: 80g Battery: 50 hours (without backlight) Waterproof: IPX7 Suitable for: Touring Bicycle, Road Bike,MTB, bmx Feature: GPS Waterproof IPX7 ANT+ Wireless Type: Bicycle Wireless Stopwatch Speedometer White 1 Black 1: Speedometer+code+cadence sensor White 2 Black2: Speedometer+code+heart rate