This is a TV booster that was installed when the house was newly built. When I had Starlink and a terrestrial digital TV design antenna installed by a separate contractor, they said this existing booster was unnecessary, so they removed it from the information distribution panel. Sun Electronics CS/BS/CATV/UHF BOOSTER MMB-K30W 4K8K compatible It amplifies signals for terrestrial digital TV, BS, CS, CATV, and fiber optic TV, etc. There may be minor scratches from when it was removed.