... -Definition headphone amplifier with many input options, which includes digital inputs from optical, coaxial, USB, and analog input from AUX IN/ ... and functions.- Flexible input and output compatibility. It has USB, optical, coaxial, stereo inputs, line out, and stereo output- Works ... , and weights 160g- Comes with power adapter, leather pouch, optical cable, USB cable, 3.5 to 3.5 interconnect, rubber ...