Combining all that you need to run, the run pack features the Wahoo Key and the Wahoo Fitness soft heart rate belt in a convenient bundle. What is Wahoo Fitness? Wahoo Fitness products wirelessly connects your smartphone to fitness sensors. With Wahoo Fitness, your phone, the best fitness Apps and real-time activity stats are all in the palm of your hand - or on your arm, or mounted on your bike. smart phone. smarter athlete. Wahoo Run/Gym Pack for iPhone Combining all that you need to run, the run pack features the Wahoo Key and the Wahoo Fitness soft heart rate belt in a convenient bundle. Wahoo Fitness wirelessly connects your iPhone 3G, iPhone 3GS, iPhone 4 or iPhone 4S to your favorite fitness measuring devices, including your heart rate sensor. With the Wahoo Key, your phone, your favorite playlists, the best fitness Apps and real-time activity information are all in the palm of your hand... or strapped to your arm! Features very low power usage no internal battery compact yet rugged similar size to iPhone charging plug compatible with iPhone 3G, 3GS, 4, 4S, iPod touch, iPad fits into 30-pin connector sends and receives signals up to 10 feet unobstructed wireless ANT+ AP2 ultra low power technology licence free, 2.4 GHz ISM band operation www.thisisant.com Weight 3.5 grams (0.12 ounces) Color black Includes 1 Wahoo Key 1 Wahoo Fitness Soft Heart Rate Belt