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▶ Ideal for the bank. securities. hospital. bus station etc.
▶ Where guard glass again theft is installed.
▶ Main unit is made of luxurious aluminum alloy and internal microphone for extension.
▶ One-wire connection and simple installation.
▶ High quality speaker for main unit and extension.
▶ High sensitive microphone. Longer metal tube microphone for dual-way intercommunication.
▶ Adjustable volume with separate switch.