Feature:1. BLOCK 88–108 MHZ BANDS: Works for blocking broadcast FM bands between 88–108 MHz with more than 50dB attenuation, useful and practical2. ACCURATE ALUMINUM ALLOY SHELL: Adopt good quality aluminum alloy shell, durable with accurate craftsmanship, bring strong stability3. FOR DIY RADIO SCANNER: This product is designed for software defined radio and radio scanner users, suitable for DIY users4. BRASS SMA ADAPTER: Equipped with a SMA adapter, made of good quality brass materials, possess excellent thermal conductivity and corrosion resistance5. STABLE AND DURABLE: FM broadcast filter come with stable structure, excellent performance and long service lifeSpecification:Item Type: FM Broadcast FilterMaterial: Aluminum alloy, brassFM Blocking Frequency Range: 88-108MHZPackage List:1 x Host1 x SMA Adapter