Retekess Case of 3,Retekess TW102 Bank Window Intercom,Window Microphone and Speaker,Dual-Way Interphone for Business,Office

* Durable material that Main unit is made of aluminum alloy shell and metal for outside unit * Clear and loud voice by the 4 core high strength aluminum foil shielded wire; which noise free function * Microcomputer processing circuit solves the problem of echo and squeal; Automatically 2 way intercommunication without pressing any button * Specifically two way voice signals output design for your business system recording need ;recording jack can be output both inside and outside * This system has top quality speaker and high sensitive microphone; Especially the metal tube microphone is deal for the counter and the dual way intercommunication