Wahoo Fitness Blue HR heart rate strap is the world's first Bluetooth Smart heart rate strap made for the iPhone 4S (and other Bluetooth Smart Ready devices).

This heart rate strap and App combination transforms your iPhone into an all-in-one training device, great for runners, cyclists, and other fitness enthusiasts.
The Wahoo Fitness Blue HR heart rate strap connects wirelessly to the iPhone 4S without the need for any adapters and delivers accurate real-time heart rate data through the free Wahoo Fitness App.

Additionally, our open API allows other popular Apps, such as RunKeeper, MapMyRide, 321Run, Cyclemeter and endomondo to work with the Blue HR.

With the Wahoo Blue HR and your favorite fitness App, you now have your heart rate data, your playlists, your phone, GPS maps and more-- all in one device!

comfortable, elastic fabric strap to minimize chance of chaffing strap can be hand washed accurate and reliable records data even when receiver communication is interrupted two-snap connection is easy and fast and includes adjustable length strap sends and receives signals up to 10 feet unobstructed compatible with any Bluetooth Smart receiving device waterproof up to 5 feet
replaceable 3 volt CR2032 coin cell battery
Wireless
Bluetooth Smart
Weight
Sensor Pod: 17 grams {0.6 ounces}
Strap: 28 grams {1.0 ounces}
Total: 45 grams {1.6 ounces}