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 System Material: ABS Use: Suitable for use in various places such as villa, home, office, office building, government agency, etc. Indoor Monitor Parameters: Screen: 7in TFT Resolution: 800 x 480 Ringing Tone: 16 x 4 melody Display Time: Call: 60 seconds; Monitoring: 30 seconds Number of Connecting Wires: 4 Outdoor Camera Parameters: Lens 1/4HD CMOS 1/4CMOS Resolution 800 line 600 line Lighting 0.02 LX 0.01 LX Light Source 6 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