Applications: Banks, securities, hospitals, post offices, checkout counters, business halls, ticket offices, toll gates and other places.About the window speaker system:1. Fully automatic two-way communication, automatic gain control, anti-interference, no noise function2. Special anti-side sound processing chip with automatic noise suppression function, which can effectively eliminate howling3. With a unique circuit and design, only one side can speak during the same period of time, while the other side is not allowed to speak, to ensure that both sides can clearly hear each other’s expressions4. With a recorder jack, it can output the call sound and signal at the same time5. Using high-power microphone, the appearance is elegant, the sound is vivid and clear; the internal and external volume can be adjusted separatelyPackage parameters:Weight: 1.37 pounds, length, width and height: 6.81*5.75*3.86 inchesPower cord: 72 inches, speaker cord: 76 inchesPackage includes:1 *CallToU Window Intercom1 * CallToU External speaker1 *Adapter(US plug)1 *English manual