Polar F4 Heart Rate Monitor

The predecessor of F6, Polar F4 has a more basic approach regarding heart rate monitoring and contains features that are only necessary for beginners. It uses Polar OwnCal for calorie measurement and an impressive T31 transmitter using Polar OwnCode technology to prevent interferences from other devices. Side buttons allows the user to navigate through the menu. It’s really simple and very convenient to use. Polar F4 comes in a lot cheaper than F6.

Polar F4 Men’s Heart Rate Monitor Watch (Black Thunder)