◆window intercom Main body with whole aluminum alloy with stainless steel,slave using electroplating plastic shell(triangle slave or metal slave optional). ◆The master adopts intercom special loudspeaker, and long metal hose microphone (37cm), more convenient to process two-way intercom freely. ◆Streamlined external slave with circular design, make it smart, beautiful and elegant. Internal and external connections using a four-core, high-strength pull-resistant, fully shielded foil line, stronger anti-interference, coupled with the installation of stainless steel which retain more appropriate.(Optional aluminum vice machine available). ◆Play fidelity, clear, the volume of inner and outer can be individually adjustable with unique dynamic sound indicator. ◆Microcomputer processing circuit with mute function can deal with whistler, echo.