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9
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PC function interface Suite: many PC functions including PC set, PC display, hotel
management and PC recorded & download.
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Second Line Long Time Operator: over 60secs for each line.
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Key Phone Expansion Board
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4 Lines Key Phone
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Backup Battery Interface
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Doorphone CDX001: Stainless steel and aluminium alloy board
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Doorphone CDX101: New type plastic out cover
For the detail or other expansion function, please see the complementary instruction.