Official Xbox wireless headset - Cost over £100 new when I bought them 2 years ago. As you can see both ear muffs have detached from the headset. Also the left side has broken off but still stays connected due to wiring (I used to use elastic bands to keep it together). Luckily the headset still switches on, the microphone still works and all buttons work as well as volume control on both sides. In the right hands this may be an easy fix, new ear muffs and attaching the left side would make for a bargain.
eBay