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Works with Polar products

Not a fan of chest straps? Polar OH1 is a great alternative for you: it works with all Bluetooth-compatible Polar sports watches, trackers and cycling computers.

  • 6-LED optical heart rate sensor
  • Optimized for wear on lower or upper arm
  • Bluetooth Low Energy
  • Waterproof: 30 m
  • Updatable software
  • Internal memory for up to 200 h of HR training
  • Operation time: 12 h (USB rechargeable)
  • Works as both a standalone sensor and when connected to Polar products or a smartphone

Polar OH1 is all these:
Accurate: it’s equipped with Polar’s proprietary optical heart rate solution for accurate heart rate tracking.
Versatile: Polar OH1 is a true heart rate monitoring multitalent. You can use it for countless different sports, you can choose whether you want to wear it on the upper arm or forearm, and it works as a standalone sensor, with Bluetooth-compatible Polar products, Polar Beat – our free fitness and training app and many other popular fitness apps.
Convenient: The Polar OH1 armband is easy to put on anytime, anywhere – there’s no need to moisten the strap or lift up your shirt. The long battery life (up to 12 hours) makes sure even those longer sessions get tracked.
Comfortable: The armband is made of a soft textile material. It’s machine-washable and can easily be adjusted to fit snugly and comfortably around the arm.


There are different methods for measuring your heart rate, that is, how many times your heart beats per minute. They include, for example:

  • Using your fingers to count beats from an artery on your wrist or neck (the way some doctors do it on TV)
  • Measuring the electrical activity of the heart (ECG, the graph you see the doctor on TV looking at)
  • Measuring volumetric change with LEDs and photodiode from the wrist or a finger, for example (PPG, the sensor with the green lights)


ECG stands for electrocardiograph, a visual representation of the electric signals originating from the heart. As your heart beats, those electric signals carry through your body fluids onto your skin on which you can place electrodes that measure the changes. You need to wet your chest strap before using it or use a gel to make sure that the electrodes can pick up the electric signals.

Because ECG measures the electrical activity of the heart directly, it’s best to take the measurements from as close to the heart as possible. Hence, the chest strap.

PPG stands for photoplethysmogram or photoplethysmography which means optically measuring the volumetric changes of an organ. PPG is the signal that the optical heart rate solution measures, interprets and uses to calculate your heart rate. You can – at least theoretically – measure the PPG signal anywhere from the body: from your finger, earlobe, temple or wrist, for example.

The two signals: ECG and PPG

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