intercoms
Two-way speaker systems
Intercoms are communication devices that allow two-way audio between different rooms or locations within a building.
Originally wired systems in offices and apartment buildings, the term now covers wireless units, video-enabled doorbells, and baby monitors.
The receptionist buzzed him through the intercom.
Singular: intercom.
Broadcast summoning of someone
- broadcastTransmitted media signal
- loudspeakerSound amplification device
- overheadLocated directly above
- chimeMelodic bell sound
Held telephone component
- speakerOne who talks
- microphoneAudio input device
- amplifierSignal-strengthening electronic device
- two-wayOperating in both directions
Electric signaling device
- doorbellEntry alert device
- entryAccess or submission
- gateHinged barrier in fence
- lobbyEntryway or influence-seeking
visitor · tenant · guest · apartment · keypad · unlock · entrance · ring
Untethered signal transmission
- wiredElectrically connected or jittery
- voice-activatedOperated by spoken commands
- audioTransmitted sound content
- videoRecorded moving imagery
digital · analog · Bluetooth · Wi-Fi · VoIP · signal · transceiver · circuitry
Systematic observation of subjects
- monitoringOngoing observation of something
- alarmUrgent warning signal
- guardsProtectors or watchmen
- checkpointInspection station on route
gatekeeper · lockdown · intruder · perimeter · watchman · verification
paging
Broadcast summoning of someone
- broadcastTransmitted media signal
- loudspeakerSound amplification device
- overheadLocated directly above
chime · alert · notification · schoolwide
handset
Held telephone component
- speakerOne who talks
- microphoneAudio input device
- amplifierSignal-strengthening electronic device
two-way · hands-free · talkback · substation · surface-mount
buzzer
Electric signaling device
lobby · visitor · tenant · guest · apartment · keypad · unlock · entrance · ring · reception
wireless
Untethered signal transmission
- wiredElectrically connected or jittery
- voice-activatedOperated by spoken commands
- audioTransmitted sound content
video · digital · analog · Bluetooth · Wi-Fi · VoIP · signal · transceiver · circuitry · installation
surveillance
Systematic observation of subjects
- monitoringOngoing observation of something
- alarmUrgent warning signal
- guardsProtectors or watchmen
checkpoint · gatekeeper · lockdown · intruder · perimeter · watchman · verification
- vintage officetypewriter, adding machine, mimeograph, dictaphone, Rolodex
- war roomcommand post, headquarters, operations center, ops center, crisis center
- rail safetycrossing signal, signal light, warning signal, train stop, crossing arms
- housingapartments, home, house, houses, homes
- electronicscomputer, resistors, capacitors, TVs, TV
- securitysecurity guard, security cameras, alarm system, security system, lock
intercomssatellite phones
Handsets connecting via orbit
cellular networks · ham radios · public address systems · megaphones · walkie-talkies
intercomsdirect speech
Exact quoted utterance
messengers · physical presence · couriers · semaphore · smoke signals
- intercom systemInternal communication device
- video intercomDoor-mounted audiovisual communicator