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Plugs into the USB port of your computer! For use with computers that are not IRinfrared? compatible. The Polar IR Interface quickly transfers the data from your HRM to your P.C. so you can take an in depth look. The IR Interface also permits you to upload your training zones and timers from your PC for easy programming. Store and analyze critical performance data and maintain a detailed training log. IR interface works with the Polar S610, S710* and S810*.