* Audio Communication: Provides clear and soft voice communication with a visitor at the door unit. * Door Release: Equipped with a dedicated button on the internal unit to electronically open the door or gate (requires compatible door opener/lock, sold separately). * Wiring: Uses a simple 2-wire installation, which makes it easy to set up or replace existing two-wire systems. * Wiring Distance: The system has a maximum reach of up to 300 meters with a 0.65 mm wire. * Power Source: Operates on standard electrical voltage (127V or 220V AC, 50/60 Hz, check specific product labeling). * Installation Type: Designed for surface mounting on a wall. Made in Korea.