Channel Master CM-7777HD TV Antenna Amplifier with Adjustable Gain Improves signal quality Indoor/Outdoor heavy-duty housing Adjustable amplification (17 dB/30 dB) with flexible USB powering options Blocks LTE interference from 3G/4G Smartphones and transmitters with EMI & FM Out of band filtering (Does not pass FM signals) Includes Amplify TV antenna amplifier, USB Power Cord, Power Inserter, Power Adapter, (2) mast straps and (3) mounting screws