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2. Emergency communication system - Wikipedia

   en.wikipedia.org/wiki/Emergency_Communication_System

   Audio Public Address Systems Audio public address speakers A system which can provide audio (usually spoken language) messaging capability, usually consisting of microphone devices, wiring, and speakers installed in public areas of buildings. These systems are typically located indoors or in smaller outdoor areas with multiple speakers, due to ...

3. Electro-Voice - Wikipedia

   en.wikipedia.org/wiki/Electro-Voice

   Electro-Voice (EV) is an American manufacturer of audio equipment, including microphones, amplifiers, and loudspeakers, focused on pro audio applications such as sound reinforcement and commercial and residential audiovisual installations.

4. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   It consisted of a microphone in one location and a remote listening post with a speaker that could also be recorded using a phonograph. While also marketed as a device that allowed broadcasting of sounds, or dictating text from one room to a typist in another, it was used in several criminal investigations.

5. Video door-phone - Wikipedia

   en.wikipedia.org/wiki/Video_door-phone

   Video door entry consists of both outside and indoor elements: an outdoor panel on the outside, an electronic lock release, and an indoor monitor. The outdoor panel or street panel is installed beside the entrance door or gateway and incorporates different elements ready for use in any climate conditions: one or several pushbuttons to make the call (usually one per home or apartment), a micro ...

6. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   Each system consists of a mixing board, sound processing equipment, amplifiers, and speakers. The microphones that are used to pick up vocals and amplifier sounds are routed through both the main and monitor systems. Audio engineers can set different sound levels for each microphone on the main and monitor systems.

7. Sound reinforcement system - Wikipedia

   en.wikipedia.org/wiki/Sound_reinforcement_system

   Systems for sports facilities often have to deal with substantial echo, which can make speech unintelligible. Sports and recreational sound systems often face environmental challenges as well, such as the need for weather-proof outdoor speakers in outdoor stadiums and humidity- and splash-resistant speakers in swimming pools. Another challenge ...

8. AOL Mail

   mail.aol.com/?icid=aol.com-nav

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school. Security alarms protect against burglary or property damage, as well as against intruders. Examples include personal systems, neighborhood security alerts, car alarms, and prison alarms.