Check the listing for details. Daytech Window Speaker System 2 Way Intercom Communication Microphone 2 Pack. Condition: Used. Listed at 60.00 USD. DUAL-WAY VOICE INTERCOM COMMUNICATION: Two-way voice intercom counter interphone adopts auto dual-way intercommunication technology,automatic indentification of processing speech signals during a call dose not require any action INDEPENDENT VOLUME ADJUSTMENT: Window intercom system has the ability to adjust the volume on the both sides; And knob design can be more convenient to operate; Less static noise or hollow sounding HIGH-SENSITIVE MICROPHONE, LOUD & CLEAR VOICE: This system adopt the advanced microcomputer. It has high quality speaker and high-sensitive microphone. Especial the microphone is deal for the counter and the dual-way inter- communication PLUG & PLAY: Just need to connect with power adapter and outside speaker to the main station; the microphone cable is flexible WIDELY APPLICATION: It suitable for the Bank window, Ticket offices,Hospital window, Post office window, Securities window, Embassy visa office, food truck , Hospital, petrol Station ,school,counter,store ,ticket booth, Christmas Gifts