Outdoor with ID card and password unlock functlon;talk with each other,colorful monitor,unlocks;could call the opposite door,communication with each other and colorful monitor,and unlockcould call another extension you like through management center,and talk to her/him,realize three way communications.Inch colorful liquid crystal screen,with a clear and steady picturedc15V+10%,9W at working time,and 0.25W when biding your time Dimensions:37.3CM*21.7CM*13.0CM Weight:1.5KGS
