Retekess's Window Intercom System is designed to lift voices and ensure the other side's voice is clearly heard through the glass or security screen. Its lightweight and compact design allow it to be installed in small spaces which is out of reach for bulky or heavy communication equipment. This Security Window Intercom System is used for the bank, office, and hospital such as ticket windows, box office windows, cashier windows, customer service windows, or anywhere a glass window speaker is needed.