A multi-functional monitoring controller, perfect for a studio environment. Power-on has been confirmed only. Other operational checks have not been performed. - Model Name: BIG KNOB STUDIO+ - Power Adapter: Included - Input Terminals: MIC, 1/4" TRS, USB - Output Terminals: PHONES, 1/4" TRS - Monitor Select Function: A/B/C selectable - Talkback Function: Equipped - Volume Control: Adjustable with the center dial - Headphone Outputs: 2 systems Thank you for viewing.