Universal Audio Apollo Twin Duo, Thunderbolt Audio-Interface 24-Bit / 192 kHz wiht 2x SHARC DSP, all UAD Plugins are processed on the DSP without using core performance from the host computer, 2x XLR/TR ¼" Mic-/Line Combo-Input, Hi-Z Instrument-Input ¼" TR, 4x Line-Ou ¼" TR, optical Digital Input S/PDIF / ADAT, Stereo Headphone-Out ¼" TRS, +48V Phantom Power switchable, Low-Cut and Pad-Button, LED-Meter, Thunderbolt-Connection, Metal Housing, Unison Preamp-Technology, incl. Power Supply and Software Realtime Analog Classic Bundle, for MAC OS only; OSX 10.8 or higher, Thunderbolt-Cable optional (not included).