... tapping and digital eavesdropping, tracking, vehicle eavesdropping, wired camera,wireless camera, electrical sources can effectively prevent eavesdropping, videotaping, fraud ... the eyes of all within sight of the camera facing the camera. Wireless Sweep: frequency detection range (1MHz- ... Receive frequency range 1MHz-6500MHz8) Special filter lens Original CC308 Wireless Signal and Camera Lens Detector