1. Band stop filter can block the FM transmission band between 88‑108 MHz, practical and useful. 2. When the attenuation exceeds 50dB, the broadcast frequency band is blocked between 88-108 MHz. 3. FM filter can be small and convenient, and its quality is guaranteed, you can use it with confidence. 4. Designed for maximum attenuation 88‑108 MHz and the maximum attenuation between the 3dB roll point is 76 MHz and 122 MHz. 5. The insertion loss is less than 0.5 dB between 0 and GHz, and mostly less than .5 dB between and 3 GHz. Item Type:Band stop filter Color:Black Material:Metal+Plastic Package Contents: 1 x Band Stop Filter 1 x connector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.