Sony MDR1ADAC/B Premium Hi-Res DAC/Amplifier-Integrated Headphones, Black Premium DAC supports full Hi-Res audio: PCM 192kHz/24 bit, DSD 2.8/5.6MHz, Direct Digital Connection for PC, Walkman, Xperia, and Apple devices, 2 in 1 integrated use: Hi-Res Headphones + Headphone DAC and amplifier Sound Reproduction up to 100 kHz (for High Resolution Audio), 40 mm ALCP diaphragms for articulate audio reproduction (3-100 Hz), Asynchronous, precision USB clock for superior sound, S-Master HX digital amplifier for unparalleled sound Passive use for normal, corded operation without battery, Ergonomic ear pads for powerful response and long-term comfort, Silver coated OFC cable minimizes signal transmission loss, Beat Response Control for improved bass and transient response Enfolding structure for wrap-around feel and improved acoustic seal, Inward axis structure delivers optimum fit, Silent joints won't disturb your audio experience, Auto input select: (iOS, USB, Walkman, Xperia) Digital and Analog input Built-in Lithium-ion battery for up to 7.5 hours on-the-go playback, Supplied: USB and Walkman, Xperia, Lightning Connector, standard audio cables, and carrying pouch