If you like to live dangerously, the Wahoo Fitness ANT+ Key for iPhone 4 will allow your phone to connect to any of your ANT+ fitness sensors, such as your heart rate monitor or speed sensor, but without the added security of the water and shock proof case. One of the most amazing features is that it gives you the ability to troubleshoot your Quarq power meter with the Qalvin App. With The Wahoo Key, your phone, favorite playlists, and the best fitness Apps and real-time activity information are all in the palm of your hand…or strapped to your arm.
Very low power usage
Compact yet rugged
Sends and receives signals up to 10 feet
Wireless ANT+ AP2 ultra low power technology license free, 2.4 GHz ISM band operation
Weight 3.5 grams (0.12 ounces)