Wahoo Fitness wirelessly connects your iPhone to your favorite fitness sensors, including your heart rate sensor, speed & cadence sensor, stride sensor plus any ANT+ device such as a powermeter. With the Wahoo Key, your phone, your favorite playlists, the best fitness Apps and real-time activity information are all in one spot.
The Wahoo key uses very little power and there is no internal battery. It is compact yet rugged and similar size to iPhone charging plug. Signals are sent up to 10 feet wirelessly. ANT+ AP2 ultra low power technology license free, 2.4 GHz ISM band operation.