USB-powered audio interface with multiple input terminals and volume adjustment knobs. - Model: S2t - Input terminals: CH1/R, CH2/L, MIC - Output terminals: R/L/Mono, AUX IN Thank you for viewing. This is a Zoom S2t. I purchased it used about a year ago, but I'm selling it because I've switched to a more compact one. There are no major scratches. It has never been disassembled. Feel free to negotiate the price or ask for additional photos. I want to sell it quickly because I need the money soon. I'll lower the price.