System functions
*Built in 4.3 'color LCD screen, ultra-thin body design
*Equipped with emergency alarm function, it can monitor the situation at the entrance of the unit;
*Can receive secondary confirmation of the entrance machine;
*24 classic chord ringtones (optional)
*Innovative circuit design, clear images, and perfect sound quality during calls
*The extension wiring port adopts a mother child plug-in interface, which is convenient for users to disassemble and install on their own
*The extension has low electrode consumption in standby mode, and long-term use can save a lot of energy