Professional Window Intercom Microphone for Bank Hospital Station Model:D-850 ●Ideal for the bank, securities, hospital, bus station etc. where guard glass again theft is installed. ●With master mic and slave mic, one wire for connection, easy to operate ●Longer metal tube microphone for dual-way intercommunication; ●Adjustable volume with separate switch. ●Auto dual-way intercommunication without pressing any button; ●Double-track adjustment with indicating light; ●Spare record jack for the bank; ●Anti-interference and noise-free function;
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