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Best Telephones | Telephone System Addons - Door Entry Systems | Most Popular Door Entry Models | Ulydor Four Button C4N 4 Button Sub-Control Unit
Push button unit with four buttons. Must be used with Ulydor control unit to increase the number of door entry buttons, for example:- C4N + UC0N provides four buttons- C4N + UC1N provides five buttons- C4N + UC2N provides six buttons- C4N + M4N + UC2N provides ten buttons
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