POLAR 4J Optical Heart Rate Sensor User Manual
The Polar 4J Optical Heart Rate Sensor user manual provides step-by-step instructions on how to set up and wear the sensor for training purposes. Discover how to charge the device, download the Polar Flow app, and use the sensor with various fitness apps and training devices. Suitable for wearing on your arm or with swimming goggles, this versatile heart rate sensor is a must-have for fitness enthusiasts.