Hi All... found a pair of full-size headphones lying around in the office that I cannot identify? The brand isb capital "D" with 3 dots underneath. It has a small USB (mini-B?) port inset in the left-hand earphone which is so deep that I had to shave the plastic collar off a standard USB cable to attempt a connection/charge.
Having done that I can't detect it, whether wired in Windows 7, or remote through iOS or Android Bluetooth / wireless. There are no other dials, buttons or LEDs that might lead me to suspect this is a wireless device.