The visiting guests outside a doorbell,Website:://.anessbreaker.com, indoor machine automatically open the image, also sounded default music, according to the indoor machine answer key with the visitor calls, light press the unlock button lock, electric automatically open, no longer ran to the door, open the door, usually in standby, press key, monitoring can monitor the external environment.VDP-V04TechnicalOutdoor CameraWorking Distance of infrared Light:>4mOperating Temperature:-15℃ ~ 50℃ Illumination: 2 LUXResolution: >420 TV lines (CCD)>780 TV Lines (CMOS)Viewing Angle: 90° wide angleMaterial: PlasticInstallation:Surface-mountDimension:113*197*33mmVDP-VS8TechnicalIndoor Monitor Screen Size: 7'' TFT-LCDResolution:800(H)*3RGB*480(V) Outline Dimension:240*150*23mmMaterial:Plastic and Metal Adapter input voltage:AC100~240V 50Hz/60HzAdapter output voltage