This filter: It uses a combination of 1.2G BPF and 868M 915M BSF. This filter in combination with TBS 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 transmission signal. When used in conjunction with TBS , 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 . This filter helps to block 868MHz and 915MHZ signals. Colour:black Material:Plastic + Metal Due to different product batches, the appearance , which does not affect the use Package Contents: 5 * 1.2GHZ VRX 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.