They come with a much longer cable at 3.5m (Standards are 1.5m). Premium Headsets have tilt and twist ear cups that are extremely comfortable for all-day use. They also cup over the ear as opposed to sitting on the ear as per the standard headsets thus cutting out even more unwanted background noise. 

Please note, the headphones are now black in colour apposed to the white in the images.

This is for two headsets, x1 for you (Therapist) and x1 for you client.