Polar unveils an affordable heart rate tracking armband | Engadget
Hands-on: Polar's OH1 Standalone Optical HR Sensor | DC Rainmaker
Polar's arm-based OH1 heart rate sensor gets three new colourways - endurance.biz
Polar OH1 | Using OH1 as an independent training device - YouTube
Polar - Introducing Polar OH1 optical heart rate sensor. Optimized for use on the lower or upper arm, Polar OH1 provides an alternative method for measuring your heart rate during training. In