This is a device that mixes and amplifies BS4K8K.CS.CATV signals, and can also supply power to a BS antenna. This is a booster that amplifies 4K8K satellite broadcasts (3224MHz), CS/BS-IF, CATV, and terrestrial digital broadcasts. It is used to strengthen radio waves when the TV signal is weak or when it is necessary to send the TV signal to multiple TVs. This product has a high-shielding structure that is resistant to and does not easily affect radio waves such as Wi-Fi, mobile phones, professional radio, and amateur radio. Amplification band: CATV uplink 30dB, CATV, terrestrial digital downlink 38dB, BS/CS 35/45dB. BL Excellent Housing Component Certified Product. *The power pilot lamp in the second photo has been confirmed to be working properly. This item was in use until recently. The item for sale is only the item itself. There are no instructions. Operation check/power-on check has been confirmed to be normal, but since it is a used item, no claims and no returns are accepted. We cannot respond to price negotiations, so please understand. #TVBooster #TVBooster #Booster #Amplifier #DXAntenna #MasproAntenna #4K8K #TerrestrialDigital #UHF #BS