[Highly Sensitive Microphone] Featuring a high-power microphone with an attractive design, this unit delivers lifelike, clear voices. The main unit and extension units can be adjusted independently. [Independent Volume Control] The window intercom system allows for simultaneous volume adjustment on both sides. The knob design makes operation easier and reduces static and hollow sound. [Adjustable Neck Support and Anti-Interference] The wired microphone also features an adjustable gooseneck mast for maximum wearing comfort and voice clarity. The 42dB microphone sensitivity effectively reduces static noise. [Easy Operation] The window microphone is ideal for voice communications in enclosed business windows or noisy locations. The window intercom is plug-and-play and extremely easy to install. [Wide Application] The intercom system is widely used in service windows such as banks, post offices, ticket offices, toll booths, and train stations.