LCD Screen Display: The 7-inch display allows you to easily see the faces of visitors. It is safer and more practical. Wide Viewing Angle: 90-degree wide-angle lens allows you to see a larger picture without missing any visiting friends. The outdoor camera build-in IR LED light. With this function, you can see outside no matter day or night, keep your house more safer. Built-in microphone supports bi-directional communication between indoor monitor intercom and outdoor doorbell.ultra-clear sound quality without any noise. The fingerprint outdoor unit is controlled by fingerprint sensor and code, it is internal integrated with the visual intercom circuit to connect indoor monitor.and use it to intercom, and unlock the door.It is also possible to use inductive card unlock., Manufacturer: QAXRZCUCD