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The intercom "Electronics PU-01" was produced from I-kv 1990. The device is designed to negotiate with a remote subscriber on a two-wire line. The device consists of 2 blocks, the main and remote. In the intercom, it is possible to pitch a large block from a small one and vice versa. High sensitivity and output power allows subscribers to be up to 100 meters or more from each other. Power is supplied from 6 A-343 elements.