Fostex HP-A4 BL, Headphone amplifier and DA converter, Up to 24 bits / 192 kHz, BurrBrown chip, Selectable digital filters, Frequency response: 20 - 80000 Hz (+/- 3dB @ 32 ohms / 100mW), Two-stage switchable basic reinforcement, Recommended load: 16 ohms to 600 ohms, DSD support up to 11.2 MHz, MicroSD card slot, Dimensions (W x H x D): 150 x 34 x 157 mm, Weight: 630 g, Includes external power supply and USB cable@+*Connections:*@+@+, 2x RCA line output (L / R),, Optical digital input and output, USB, Stereo headphone output: 4-pin XLR balanced and 6.3 mm jack unbalanced