Brand new and factory sealed.
This is a USB-powered, asynchronous-transfer, 24/96-capable outboard Sound Card/DAC for PCs or MACs that incorporates a 130 milliwatt headphone amplifier that is accessed via a front-panel stereo 1/8" mini-jack output. The HeadStreamer incorporates a digitally-controlled, fully analog built-in attenuator that is controlled by the computer's overall (digital) volume control. It is optimized for maximum output with (most portable modern) headphones that have an impedance of about 100 ohms or less, but it will happily play with higher-impedance phones such as Sennheiser 580 or 600, though with a bit less output.
This is a great solution for those wanting a small, super-clean dedicated headphone amp for use on computer desk systems, or to take with you for use with a laptop or net-book computer when traveling.