Astell & Kern AK120II High Resolution Digital Audio Player with iBasso D14 Optical Audio Amp, Extreme Audio Wall Charger, Optical Audio Connection Kit Astell & Kern AK120ii Mastering Quality Digital Music Player with iBasso D14 Bushmaster Portable Headphone Amp with Optical Audio Input, Optical Audio Connection Cable with Extreme Audio High Speed USB Wall Charger Kit. 256GB Internal Storage Expandable up to 384GB Direct Stream Digital (DSD) offers more dynamic range Buttero, Hand Made Italian Leather case Included. 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