I bought a used Samsung txr 2765a recently. It came with an extra unit. This unit has a wall wart power supply, a coaxial in and out, 4 inputs, 1 output, two buttons on the front panel, and no model number whatsoever. I think it has something to do with digital TV, but can you tell me the model # so I can look for a manual and try to figure out how to use it? The TV works fine, so I guess I don't need this extra unit, but I'd like to know what it's for......Thanks