Feature: 1. 1 TO 2: This video doorbell system includes 2 pcs indoor units and 1 outdoor unit, supports 2 way intercom and internal intercom. The outdoor camera has night vision function, you can see visitors clearly at night. 2. MULTI FUNCTION: The indoor monitor adopts 7 inch true color TFT screen, presenting clear images, supporting hands free call, monitor, unlock and more function. 3. VARIOUS RINGTONES: Image brightness, chromaticity, and ringtone volume can be adjusted, and multiple chord ringtones can be freely switched, elegant and pleasant. 4. SIMPLE INSTALLATION: This video intercom doorbell adopts 4 wire system, the installation is very simple and convenient, users can install it by themselves. 5. WIDE USAGE: This video intercom doorbell set is ideal for use in villas, homes, offices, office buildings, government agencies, and other places. Specification: Item Type: Video Doorbell Material: ABS, aluminum alloy Use: Suitable for use in various places such as villa, home, office, office building, government agency, etc. Monitor Parameters: Screen: 7in TFT Resolution: 800 x 480 Power Supply: DC15V 2A Ringing Tone: 16 x 4 melody Display Time: Call: 60 seconds; Monitoring: 30 seconds Number of Connecting Wires: 4 Camera Parameters: Lens: 1/4HD CMOS Light Source: 6 IR LED Installation Method: Surface installation of outdoor unit, hands free wall mounting of indoor unit. Package List: 2 x Monitor1 x Outdoor Unit5 x Terminal Wire9 x Screw8 x Anchor2 x Mounting Bracket2 x Power Adapter1 x User Manual