【Dual-way Intercommunication Window Speaker】 Two way voice intercom communication technology,automatic indentification of processing speech signal during talking but not need any action. 【Loud and Clear Voice】High-sensitive Microphone,the voice from this system is clear anad natural,and the main station and outside speaker volume can be adjusted separately. 【Anti-Interference &Adjustale Neck】The wired window intercom microphone has an 360° adjustable gooseneck type,effectively recording sound; allows you to easily communicate with customers without getting close to the microphone. 【Simple Operation】The window counter intercom is plug and play, and very easy to install it.Comes with sticker, which could attach the outside speaker to the window easily. 【Widely Application】It is suitable for the Bank,Ticket offices,Hospital, Post office,Securities,Station where the security glazing is installed.