Feature: 1. Screen and Camera: 7 inch high definition large screen, 1/4in HD CMOS camera, clear images, two way radio, smooth intercom, and equipped with unlocking function. 2. Night Vision: Equipped with 6 IR LED light sources, with high definition night vision, built in high sound quality microphone, effectively monitor the outside. 3. Practical: 16 ringtones to choose from, four levels of volume adjustment, supports 60 seconds of calling, 30 seconds of monitoring, suitable for AC100‑240V power supply. 4. Installation: Four core wire system, 30 meters need 0.5 mm wire, 50 meters need 0.75 mm wire, 100 meters need 1 mm wire, easy and convenient installation. 5. Wide Application: Suitable for use in villas, homes, office, government units, etc., surface installation of the door machine, and wall hanging of indoor machine . Specification: Item Type: Home Video Doorbell.Material: ABSMonitor Parameters: Screen: 7in TFT Resolution: 800x480 Power Supply: DC15V 2A Ringtone: 16 melodies 4 level adjustable Display Time: 60 seconds of calling, 30 seconds of monitoring Connecting Lines: 4 linesCamera Parameters: Lens: 1/4HD CMOS Light Source: 6 IR LEDInstallation: Door machine surface installation, indoor unit wall hangingPower: AC 100-240VApplication: Suitable for villas, homes, offices, office buildings, government units and other places Package List: 1 x Monitor1 x Outer Machine4 x Terminal Cable9 x Screw7 x Expansion Tube1 x Sticker1 x Power Adapter1 x Manual