1, 7'' LCD touch screen. Smoothy and clearly. 
2, Surface mount only. 
3, Multi-way communication, video intercom with Gate Station, Guard Station & Front door station. 
4, Door to door intercom. 
5, Monitor the outside camera capture. 
6, Snapshot and save function. Voice message. 
7, Call-divert, Non-disturb can be setted by the user. 
8, Home automation, control kinds of home appliance(TV, air-condition, curtain^)