This product applies Astell & Kern's independent A-Amp technology so you can hear deeper and richer imaging sound from the A-Amp by receiving a digital signal from iPhone 5 and fifth-generation iPod Touch. Astell & Kern 10 is subminiature and light equipment which is 54 mm in size and 51g in weight. Is has an analog volume wheel of Astell & Kern series, and its design to symbolize Astell & Kern 10's own turntable enables users to control the volume in detail, using the device connected to Astell & Kern 10. It can be used as a portable DAC, too, through connection to iPhone 5 and fifth-generation iPod Touch.