Wahoo RPM Speed Sensor Bluetooth and ANT+ Cycling Speed Sensor The Wahoo RPM speed sensor is the sleek, magnet-less solution for capturing cycling speed data. It 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. Features Dual Band Technology. Both ANT+ and Bluetooth Smart capabilities allow for a wireless connection to both smartphones and GPS devices. Wireless Connection. No tangled wires on your bike to connect the sensor to your device. Sleek, Lightweight Design. It only weighs 16.5 grams Speed Measurement. Provides accurate speed data during your ride Hub Mount. Mounts on most front wheel hubs with a secure silicone casing. Visible Connection. Two LED lights show the sensor's device connection (blue) and cadence detection (red). Replaceable Battery. No charging required! Operates on a coin cell battery for up to 1 years. Universal Fit. The Speed Sensor will fit with most bikes and frame sizes Specifications Part Number: WFRPMSPD Dimensions (LxWxH): 1.25" x.75" x 1" Weight: 16.5 grames (Speed) 7 grams (Cadence) Battery: CR2032 Battery Life: Up to 12 Months Water Rating: IPX7 (waterproof up to 5 ft) Wireless Signal Strength: Up to 10 feet In the box RPM Speed Sensor CR2032 Batteries (installed) Hub mounting option Quick Start Guide Important Product Info Guide