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 buttons Night vision function, 6 night vision infrared lights. Intercom function between indoor monitor and outdoor unit Specification: Voltage:100-240V Plug type: AU plug Display resolution: 840*480 System: PAL /NTSC (alternative); Power supply mode: switch power supply ac110-240v 50Hz/DC15V 2A; Current: less than 800mA; Call delay time: 120S±10%; Monitoring delay time:60S±10%; Camera sensor: hd color CMOS; 700 line Outdoor 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 + 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: 180*120*18mm/7.1*4.7*0.7in Outdoor:180*90*20mm/7.1*3.5*0.8in Weight: Approx.1953g/68.9oz Package list: 1 * outdoor unit 2 * indoor monitor 2 * power supply 2 * 5m quad conductor 1 * 2 core interface wire 2 * set mounting screws 1 * English manual 4 * quad port line