Apartment 2 units independent 7 inch color LCD Intercom doorbell, two households independent, separate video, talk to each other, unlock.Features:Indoor monitor:7 inch digital color LCD screen, no radiation and low power consumption, true high definition 16:9 widescreen display.Ultra-thin design, aluminum panel, electroplated keys, high-grade beauty all show luxury style.With Speakerphone function.Active monitoring of outdoor functions.16 ringtones optional, beautiful sound.The brightness, color and volume of the image can be adjusted synchronously at will.One-key unlock function.Outdoor unit:Electronic control unlock function (open the lock with power on, and use the special access control power supply if the lock is opened without power).All metal waterproof and explosion-proof.Two separate buttonsNight vision function, 6 night vision infrared lights.Intercom function between indoor monitor and outdoor unitSpecification:Voltage:100-240VPlug type: EU plugDisplay resolution: 840x480System: PAL or NTSC (alternative) Power supply mode: switch power supply ac110-240v 50Hz or DC15V 2A Current: less than 800mA Call delay time: 120S10 percent Monitoring delay time:60S10 percent Camera sensor: hd color CMOS 700 lineOutdoor infrared night vision function: low open 10LUX infrared open Indoor monitor installation: wall-mounted Outdoor monitor installation: wall-mounted Connecting wire: standard 5-meter 4-core connecting wire and 15cm 2-core terminal wire (connected with electronic control lock) Effective distance: can be connected to 200 meters of cable, image, intercom work normally Indoor machine: 180x120x18mm or 7.1x4.7x0.7inOutdoor:180x90x20mm or 7.1x3.5x0.8inWeight: Approx.1953g or 68.9ozPackage list:1 x outdoor unit2 x indoor monitor2 x power supply2 x 5m quad conductor1 x 2 core interface wire2 x set mounting screws1 x English manual4 x quad port line