Polar IrDA USB 2.0 Adaptor 

THIS IS THE REPLACEMENT FOR THE OLD USB

Once you’ve completed your training, you’re ready to view the results using the Polar ProTrainer 5 software. The IrDA USB Adapter provides that link by enabling a two-way infrared data communication between your Polar product and PC.
Set contains installation CD and a cable

For communication with RS400, RS800,625x, 725, 725x, 720i, 710i, 610i, s810i, axn 500, axn 700, cs600 models only.

NOT compatible with 610, 710, 810, E600 models