4.3" Screen, Resolution 320 x 240, SOS Alarm, Door Release, Monitoring, Brightness & Control, Nigh Vision Light, Built-in Speaker. Features: 4.3" ScreenResolution 320 x 240SOS AlarmDoor ReleaseMonitoringBrightness & ControlNigh Vision LightBuilt-in Speaker INDOOR UNIT SPECIFICATION: Screen size : 4.3", Adapter input voltage : AC100-240V 50Hz60Hz, Monitoring time : 30S+10%,