Children's intercom `` Roll call-M ''.

Everything else not included in the sectionsInterphone devicesChildren's intercom "Pereklichka-M" has been produced possibly since 1985 in Leningrad. The intercom is intended for two-way wire communication between two subscribers at the distance of the existing double wire, the set includes a wire about 10 meters long. One intercom has an audio frequency amplifier powered by a Krona battery, a double call button (one call tone 1 kHz, second gear) and a loudspeaker, the other device has only a loudspeaker and a call button.