The Wahoo™ Fitness Blue Heart Rate Strap is specifically built for the iPhone™ 4S to turn your phone into everything you need.

• Heart rate monitor strap.
    - World's first Bluetooth™ Smart HR strap for the iPhone™ 4S.
    - Easy and fast to connect (2 snaps).
    - Adjustable length strap is included.
    - Accurate reading: reliable to the point that it records data even when the receiver communication is interrupted.
    - Strap: comfortable, fabric with elastic for stretch and reduced chafing.
    - Strap can be hand-washed for ease.
• Wireless for Bluetooth Smart phones.
    - Compatible with any Bluetooth Smart receiving device including the iPhone™ 4S.
    - Turns the phone into a training device.  
    - Signals: sends and receives up to 10 feet (unobstructed).
    - Not compatible with the iPhone 3G, 3GS or 4.
• Compatible Apps: Wahoo fitness, MotionX, RunKeeper, Runmeter, Cyclemeter, MapMyRUN, MapMyRIDE, 321run, Endomondo and more.
• Ideal for running, cycling, fitness, and other athletic activities.  
• Battery: 3 volt CR2032 coin cell.
    - Replaceable.
• Waterproof up to 5 feet.
• Weight: Pod: 17 grams.
    - Strap: 28 grams.
    - Total weight: 45 grams.
• Imported.