Compact USB headphone amplifier with touch controls. - Brand: Sennheiser - Connection Type: USB - Output Terminals: Headphone jack - Cable Color: Red - Features: Touch control - Input Terminals: USB terminal - Design: Compact and stylish Thank you for viewing. I connected it to a PC, but it's unresponsive. A bargain for someone who can fix it. USB external product Please purchase only if you understand that it is junk. #SENNHEISER #Sennheiser #Headphones