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