The casing of the device is made of metal, so the internal circuitry is impervious to external wireless interference. In cases where walkie-talkies with higher power output may potentially cause interference, especially when using HDMI/SDI cables with poor shielding, it could result in a black screen. In such situations, we recommend replacing the cables with ones that have better shielding. Keeping a safe distance of at least 1 meter between the walkie-talkies and the cables is advisable. Opting for a wireless communication system with lower transmission power is another secure solution.