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【HIGH QUALITY COMMUNICATION】CallToU window speaker intercom is a perfect tool to make your completely hands-free communication.automatically identify the processing speech signals during a call;anti-interference and noise-free function,solves the problem of echo and buzzing. 【WIDE APPLICATION SCENARIOS】Suitable for the voice communication in closed business window or noisy places. the product is widely used in banks,hospitals,stations and other service windows. 【HOST & EXTENSION】There are both the main unit and the extension in intercom for window,have 78.74IN wire speaker and high-sensitive microphone, and the volume can be adjusted separately. 【EASY TO INSTALL】It's plug and play.Insert the plug of external loudspeaker box into the loudspeaker jack of the main unit.The outside speaker has a sticky backing that can be stuck to the window glass. 【RECORDING & LONG WORKING】There is a recording jack , which can be connected to a recording device in window intercom system for business.Able to work continuously in a long time clearly.Realize two-way recording conversion.