Overview The Big Knob Studio Plus Monitor Controller and Interface from Mackie is a monitor-control solution and interface, that allows you to choose between four audio-input sources and three monitor pairs. It can be used for project and professional studios and is designed to increase your workflow for recording and mixing applications. Featuring independent trim on all sources and monitor outs, the Big Knob Studio Plus has mono, mute, and dim functions along with a flexible two by four USB recording interface. It is built with two combos XLR-1/4" Onyx mic inputs with phantom power for condenser microphones. Recording and playback is at 24-bit/192 kHz resolution and the cue mix allows for controlled blending of direct inputs with other signals for zero-latency recordings. Choice of recording paths provide flexibility for applications like podcasting and more. With black R100 Stereo Headphones from Resident Audio feature 40mm full-range drivers that deliver a frequency response of 20 Hz to 20 kHz. The lightweight headphones have an adjustable headband and a closed-back design, and can be used to provide a comfortable listening experience in applications for studios, voice-overs, and more. Plus a XLR-XLR Cable. In the box Mackie Big Knob Studio Plus Monitor Controller and Interface Limited 1-Year Warranty Resident Audio R100 Stereo Headphones (Black) 1/8" to 1/4" Headphone Adapter Limited 1-Year Warranty 20' XLR Cable Complete with a 90-day warranty