This filter: It uses a combination of 1.2G BPF and 868M 915M BSF. This filter in combination with TBS Crossfire on 868 and 915 mhz improves video reception in 1.2-1.3GHz video receivers. Because of the poor filtering and wide operating frequency on the video antenna input on most common 1.2-1.3GHz video receivers, they do not properly separate the video feed from the TBS CROSSFIRE mission signal. When used in conjunction with TBS Crossfire, this filter improves video reception at 1.2-1.3 GHz video receivers. Install this filter between your video receiver and antenna and you're good to go. This filter helps to block 868MHz and 915MHZ signals. Colour:black Material:Plastic + Metal Due to different product batches, the appearance may vary, which does not affect the use Package Contents: 5 * 1.2GHZ VRX NOTCH Filter 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.