Sony PHA-1A Portable High-Resolution DAC and Headphone Amplifier, Channels Single Channel, Battery Power Option

Easily connect to your portable digital music device or PC via USB input to enjoy powerful, pintsize Hi-Res audio performance on the go. The PHA-1A supports audio file formats up to 192kHz/24-bit. The Hi-Res DAC and amplifier circuitry complete with lithium-ion battery ensure you make the most of your music wherever you go.