closed circuit television (cctv) equipment, audio systems, microphones, electronic control equipment, cable and wire, mixer amplifiers, power amplifiers, clocks, closed circuit television (cctv) accessories, connectors, audio mixing consoles, loudspeaker systems, loudspeakers, microphone stands, professional microphones, remote control systems, mixer power amplifiers, wireless microphones, home intercom systems available from national sound industries based in bay shore, ny. click the links below to visit our website or contact us via our profile page.