Feature:1. VIDEO INTERCOM SYSTEM: This four wire video intercom system includes 1 outdoor device and 2 indoor monitors, supporting 2 way call, monitor, and remote unlock, allowing contactless interaction with visitors.2. HANDS FREE MONITOR: With 7 inch true color TFT screen, the hands free indoor monitor provides clear image display, ensuring a convenient and comfortable user experience.3. COLOR NIGHT VISION: Equipped with white light full color night vision function, this video intercom system allows for clear observation of nighttime visitors through colored night vision, ensuring security.4. MULTI ADJUSTABLE: The system allows for the adjustment of image brightness, color saturation, and ringtone volume, offering customizable settings and a variety of chord ringtones.5. WIDE APPLICATION: This doorbell system is easy to install and is suitable for various locations such as apartment, home, office, commercial building, and government institution.Specification:Item Type: Video Intercom SystemMaterial: ABSUse: Suitable for use in various places such as villa, home, office, office building, government agency, etc.Indoor Monitor Parameters:Screen: 7in TFTResolution: 800 x 480Ringing Tone: 16 x 4 melodyDisplay Time: Call: 60 seconds; Monitoring: 30 secondsNumber of Connecting Wires: 4Outdoor Camera Parameters:Lens1/4HD CMOS1/4CMOSResolution800 line600 lineLighting0.02 LX0.01 LXLight Source6 LEDs.Package List:2 x Monitor1 x Outdoor Unit5 x Terminal Wire12 x Screw12 x Anchor4 x Mounting Bracket2 x Power Adapter1 x User Manual