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Mode 1 - Direct application of power. 12V AC or DC is applied to the unit; the sound plays for the duration of the applied power. Mode 2 - Triggered by an isolated contact. The unit is permanently powered from 12V AC or DC.
We design and manufacture an impressive range of audio and video door entry telephones incorporating innovative features and functions demanded by the expanding door entry systems and access control markets.
View and Download Bell System 2-72 Multi Way installation and operating manual online. tabellet 2-72 Multi Way Video Door Entry System With Hands-free Colour Apartment Stations. 2-72 Multi Way intercom system pdf manual download.
The Western Electric model 500 telephone series was the standard domestic desk telephone set issued by the Bell System in North America from 1950 through the 1984 Bell System divestiture.
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The 900 Series door entry systems are recognised for their high quality and competitive pricing and are widely accepted as the industry standard. Each system provides all of the components necessary to install a complete audio door entry system; including a surface lock release as standard.
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