Wahoo RPM Speed and Cadence Sensor Bundle with Bluetooth & ANT+ The Wahoo RPM cadence sensor is your sleek little solution for measuring cycling cadence data. It's wireless, magnet-less, lightweight, and easily mounts to your bike's crank arm or to your shoe. Bluetooth 4.0 and ANT+ dual band technology allows you to connect to and display data on both smartphones and GPS bike computers. Collecting cadence data has never been this easy. Dual band technology Both ant+ and ble 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 7 grams! Cadence measurement Provides accurate cadence data during your ride Two bike mount options (1) mount with double sided 3m tape, or (2) use the silicone sleeve and mount with zip ties. Shoe mount option The rpm can be worn on your shoe for spin classes or use with multiple bikes 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 Sensors fit with most bikes and frame sizes This device works with the iPhone 4S and newer, iPad (3rd generation and newer), iPad mini, iPas Air, iPod Touch (5th generation), and compatible Android devices.