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Features: 1,Dual-way intercommunication 2,Dual-way audio record 3,Anti-interruption and noise 4,Slim fit design of speaker 5,Input voltage: AC 110-240V 6,Streamline design: The main unit has aluminum alloy shell, and the extension has built-in speaker.This system has simple connection for DIY operation. 7,High quality: This system has top-quality speaker and high-sensitive microphone. Especial the metal tube microphone is deal for the counter and the dual-way inter-communication. 8,Good performance: The voice from this system is clear,and natural. There is a switch only for the volume control. 9,Advance technique: For this system,we adopter the advanced microcomputer from U.S.A. 10,Definite instruction: The indicating lamp shows the track's working status. 11,Simple operation I: Easy for dual-way intercommunication without pressing button. 12,Simple operation II: This system haw two knobs to adjust the inside and outside volume. When the indicating lamp for audio turns green,the intercommunication could begin. 13,Simple operation III: You could record the voice through record jack. 14,Best Choice: It suitable for the Bank, Securities Company , Hospital, Station where the security glazing is installed. Specification: Working voltage: DC9V/0.5A Input voltage:AC 110-240V Main sound (sub sound): 2W, 100Hz-15KHz Inside microphone: -48db 20Hz-20KHz Outside microphone: -48db 20Hz-16KHz Cable Length :1.6m/5.25ft Main box size :158x87x46(335)mm / 6.2"x3.4"x1.8"(13.2") Sub-box size :91x77x23mm / 3.6"x3"x0.9" Packaging List: 1 x Dual-way counter interphone 1 x External speaker 1 x Charger 1 x English User Manual