Thank you for viewing. This is a Maspro satellite mixer, model MXHWD. As this is specialized equipment for video, detailed explanations will be omitted. It has been used, so there are scratches on the exterior. There is a slightly stiff spot on the screw threads of the external metal fittings, but there are no problems with tightening and loosening. I think the cable connection terminals are in a clean condition. If you are looking for a used one, please consider it. m(._.)m