Characteristics of the 4,3" ART 4WH monitor: 4.3" screen with soft touch buttons.High efficiency loudspeakers.Call forwarding through WIFI to mobile phones (app G2Call+, available for Android and IOS).Audio communications, video and secret door opening.Video-spy functions, auto-start, doctor mode and do not disturb.Intercommunication with other units of the house selectively.Personalization of ring tones.Connection to the entrance door pushbutton, which saves the use of the doorbell.Output to auxiliary call repeater.Image memory, up to 100 photos in internal storage. Micro SD card slot for video recording.Functionality of automatic erasure of images after 30 days.Up to 4 monitors in the same house without additional power.Dimensions: 110(W) x 155(H) x 14(D) mm.