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The baby talker "Roll-M" has been produced presumably since 1986. Designed for two-way wired communication between two subscribers at a distance of the existing double wire, complete with a 10 meter wire. One intercom has a Krone battery powered audio amplifier, a dual call button (one 1 kHz call tone, second gear) and a speaker, the other is only a speaker and a call button. More detailed information on the intercom "Pereklichka-M" yet.