The Wahoo RPM Speed Sensor BT/ANT+ easily mounts to your bike's front wheel hub, and the Bluetooth Smart and ANT+ dual band technology allows you to connect to and display data on both smartphones and bike computers. Tracking speed data has never been this easy. Wahoo RPM Speed Sensor BT/ANT+ Features Dual band technology Wireless connection Magnetless Sleek, lightweight design Speed measurement Hub mount Visible connection Replaceable battery Universal fit Wahoo RPM Speed Sensor BT/ANT+ Specifications Physical Dimensions (LxWxH): 1.25 x.75 x 1 Weight: 7 grams (without mount) Battery: CR2032 Battery Life: Up to 12 months Water Rating: IPX7 (waterproof up to 5 ft) Wireless Signal Strength Up to 10 feet Note: Speed Sensor is NOT compatible with spin bikes In the Box RPM Speed CR 2032 Battery (installed) Hub Mounting Option Quick Start Guide Important Product Info Guide