Hey there...I have both versions - I have the older serial port version - I guess they might work with some Mac software - although I don't know for sure. I also have a USB version of the data transfer infrared receiver. I have a new Polar watch that came with the USB irDa receiver...so don't need these...anyone need one? Open to offers - but won't send it out for free - I'll just keep them as back up if necessary.

Cheers!

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"It's a line you have to cross to understand."