Functions: Led display and lcd screen display for option. Embedded ccd camera, it can adjust view angle and width. Night vision, elegant appearance. The key board with the back light function, it is can see the keyboard even in dark. Can use the management unit to switch the outdoor units video signal to the management center. Can use an external network controller to link all the outdoor units together in a lan. A building can be connected with six outdoor units maximum. A building max to connect 9999 indoor monitors Supports password, id card unlock, it is also can be unlocked by the indoor unit and management center. Operation with voice navigation function, it is easy for the user operate. It can compatible with audio doorphone. Technical parameter Working voltage: dc18v/2a Current: static state