The USB Interface was developed to transfer data. You can see your training results on your Polar software. The adapter permits a transfer of data between your heart rate monitor and your PC. It is compatible with Polar infrared enabled products except for Polar S610/S710/S810 et E600   Connect to a standard USB port Infrared angle of transmission 30 degrees maximum. Range 1 to 100cm Compatible with Microsoft Windows® 98SE/ME/2000/XP/Vista