Sony PHA1A Portable Hi-Res DAC/Headphone Amplifier, Silver Compact and lightweight for easy portability and use, Hi-Res audio DAC/amplifier supports up to PCM 192kHz/24 bit, Direct Digital Connection for smartphones, DMPs, iOS devices, and PCs, Solid Sound: Wolfson DAC w/separate operational & headphone amps Sleek and durable aluminum enclosure for dependable performance, Built-in Lithium-ion battery for up to 6 hours battery life, Charge the PHA-1A and a Walkman while listening (requires cable, sold separately) Selectable gain supports headphone impedance from 8 to 600 Ohm, Includes: Micro-USB and digital cables for Walkman and Xperia, Securely fasten portable devices with included silicone belts (x2)