Professional grade amplifier. 36db gain designed for use in medium to large distribution systems amplifying signals from 40MHz to 900MHz, so it works especially well amplifying cable TV and HDTV signals in homes with multiple TVs and/or long cable runs. Also amplifies indoor or outdoor TV and HDTV antenna signals for best reception. Works perfectly with cable modems. Adjustable gain control for optimum picture quality. FM trap to eliminate interference from FM broadcasts. Circuitry designed for maximum stability. Metal housing. Lightning protection. Plugs into a normal AC power outlet. UL listed. FCC Approved.Brand new in factory-sealed packaging