Polar H7 Smart Heart RATE Sensor Iphone 4/5

Accurate. Soft and flexible. Easily adjustable. Compatible with both fitness devices and smartphones. Good price. Machine washable strap. Uses Bluetooth.

Slightly bulky sensor. Only works with a few mobile apps.

Polar users in need of an accurate HRM can't go wrong with the H7, but it's also good for anyone looking to add heart rate data to their run-tracking using one of the five supported apps. And if it works with your home or gym fitness equipment, all the...