While burning through the battery in under 72 minutes, and require you to stay within 3 meters of the phone, and will lose connection if the phone goes into your back pocket. I've got three pairs of wireless headphones that all suffer these three traits.

My daughter's modern Sennheiser headphones though, work across the house, through two walls. And the battery literally lasts over eight hours, for all I know it might have lasted another eight. Seriously impressive.