Instant purchase is OK. Purchased used 5 months ago. I haven't used it except for the headphone jack, so I can't confirm the operation, but according to the previous owner, it works. Only the main unit is for sale. - Model: UR12 - Brand: steinberg - Connection terminals: USB, XLR, RCA - Function: Audio interface - Power supply: AC adapter - Volume adjustment: 2 volume knobs Thank you for viewing.