Thank you for viewing. This is a MOTU audio interface 828ES. An audio interface compatible with Thunderbolt and USB connections. It features DSP networking and MIDI functionality. 28 input channels, 32 output channels. Works with current Macs. - Model: 828ES - Connection Type: Thunderbolt / USB - Included: Manual, Thunderbolt cable (with adapter), power cable, box. - Features: DSP networking, MIDI support - Output Terminals: XLR, TRS, headphone jack Purchased new. There are no particular problems with the operation. Used in a non-smoking room. Disinfected.