Behringer 4-channel expander/gate, the XR4400. There are a few scratches on the top of the product. Power-on check only. Accessories include the power cord only. Quoted from below: (The BEHRINGER/XR4400 is a 4-channel expander/gate, ideal for noise reduction during recording and auto-mute control for microphones. Each channel is equipped with a switchable expander/gate and a sidechain filter that can narrow the operating frequency band. It is ideal for recording drums using multiple microphones.)