This is a DX Antenna CS/BS-IF/UHF booster (33dB/43dB compatible) dual booster. It is a new, unopened product. This single unit provides peace of mind regardless of your reception environment, from strong to weak electric fields. It is a dual booster that amplifies CS/BS-IF and UHF signals, supporting 4K8K satellite broadcasts (3224MHz), and allows switching between 33dB and 43dB amplification with a single switch. It is used to strengthen radio waves when the TV signal is weak or when it needs to be sent to multiple TVs. It is a high-shielding structure product that is resistant to and does not easily affect radio waves such as Wi-Fi and mobile phones. Amplification band: UHF 43dB (33dB), BS/CS 28/35dB. JEITA SH mark certified. For outdoor use.