The Wahoo Key is an ANT+ Receiver designed to allow your iPhone to collect data from ANT+ sensors. The Wahoo Key is directly compatible with the iPhone 4s using the 30 pin port and iPhone 5 and later using a 30 pin to lightning adapter. If using the 30 pin to lightning adapter, it must be Apple Certified.
Although the Wahoo Fitness Key has been tested and optimized to receive data from Wahoo Fitness sensors, it can also relay information received from the sensors of other popular fitness brands and models - basically any sensor that transmits using the ANT+ protocol.
You can also download our free Wahoo Fitness Utility App to test compatibility with fitness sensor types.