... out: the first hearing, track, car head to listen, wireless cameras, wired cameras, electrical radiation. . . . . . Can effectively prevent ... , public toilets, swimming pools, changing rooms have wireless camera; 3, entertainment or head shot to prevent ... -1900MHz) Vehicle tracking device (900MHz-1900MHz) Wireless camera. (700MHz-5800MHz) Wireless Camera (900MHz-2400MHz) Casino gambling fraud control ...