Fostex HP-A3, Headphone Amplifier and D / A Converter, With USB interface, Processes audio data on the input side with 24 Bit / 96 kHz, Internal PLL power supply for stable voltage supply, For all standard headphones, AK4390 D / A chip from AKM, 32-Bit resolution, Condensers and OP amp designed exclusively for audio products, Input selection USB / Digital (Optical TOS-Link), Output Selector Headphone / Analogue (RCA), Can be used as a D / D converter (USB to Optical), Standard USB power supply allows PC-independent operation, Power supply via USB cable or USB power supply - allows PC-independent operation (not included), For Windows and MacOS X - operating system drivers are used, Measurements (W x H x D): 108 x 140 x 35 mm, Weight: 450 g, USB cable included