Our devices are made of a metal casing, so the inside circuit is not interfered by other wireless signals. However, the power of the walkie-talkie is always huge, which could affect the transmission if the HDMI/SDI cable shielding properties are not good. To solve this issue, please replace the HDMI/SDI cable with a good anti-interference ability and keep the walkie-talkie at least 1m away from the cable.