Surveillance technology includes the following: 1. Electronic eavesdropping technology (audio surveillance) * Radiating devices and receivers (e.g., miniaturized transmitters) * Nonradiating devices (e g., wired surveillance systems, including telephone taps and concealed microphones) * Tape recorders 2. Optical/imaging technology (visual surveillance) * Photographic techniques * Television (closed circuit and cable) * Night-vision devices (use image intensifier to view objects under low light) * Satellite-based 3. Computers and related technologies (data surveillance)
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