It's a Px8. It's not an S2. It's practically new, having only been tested a few times in a room. I was deep into the headphone "rabbit hole," but I'm getting out, so I'm selling it. The shape didn't quite fit my slightly large head, so it might be best to try it out at a mass retailer before considering it. No pets, no smoking. [Bowers & Wilkins] Px8 (Black) Wireless Headphones Flagship Noise Canceling PX8/B