Astell & Kern AK100II High Resolution Digital Audio Player with Extreme Audio Wall Charger, PEM11 USB Docking Station, Optical Audio Connection Kit Astell & Kern AK100ii Mastering Quality Digital Music Player, Optical Audio Connection Cable with Extreme Audio High Speed USB Wall Charger Kit with Astell&Kern PEM11 USB Charing/Docking Station and protective case Integrated Cirrus Logic CS4398 DAC allows the player to provide high definition quality and detail, and can be used as an external DAC for PC or Mac. Additional DAC support for CD player or other digital device via optical DAC Direct Stream Digital (DSD) offers more dynamic range The AK100II has an integrated single-channel Cirrus Logic CS4398 DAC and balanced output to provide exceptional sonic quality and detail. It can also be used as an external DAC when connected to a Mac or PC via USB. The player features 64GB of internal flash memory and a microSD card slot that supports up to 128GB from a separately sold card. This allows you to store a maximum of 192GB of high definition lossless music. Wirelessly download and stream music from your Mac or PC via a Wi-Fi network. Firmware updates are available immediately from your wireless network. For MSQ streaming, the Astell & Kern MQS Streaming Server software must be installed on your PC or Mac with a shared folder