Feature: 1. Visual Intercom Doorbell: The outdoor camera is equipped with a rainproof cover, infrared sensor, and 90° wide angle camera for clear nighttime vision. Extend monitoring to front door, garden, and upstairs with wired connection. 2. Clear Sound Quality: Support handsfree and handset calling with clear voice and good sound quality. Easily adjust brightness, volume, contrast, and choose from 25 ringtones. Support electric unlocking, and external view monitoring. 3. Easy Monitoring: Intercom doorbell system allows you to easily view outside situation, 2 way intercom, call unlock for quick and convenient access. Support answer, listen, unlock functions with simple 4 wire setup and easy wall mount installation. 4. High Definition Camera: This kit includes 1 outdoor high definition camera and 1 indoor color screen. 90 degree wide view angle, high clarity for seeing and talking to visitors. Stylish and aesthetic design. 5. Stable Connection: Wired connection for clear home security vision, surface mount via easy 4 wire setup. Use indoor screen for remote unlocking of electric doors or locks. Suitable for apartments, villas, hotels, offices, and public buildings. Specification: Item Type: Video Doorbell Intercom System Material: ABS, Metal Indoor Unit: Function: Intercom, Hands free, Monitoring, Unlock, Adjust Brightness Color Volume Screen Size: 4.3in TFT LCD Resolution: 480x272 Ringtones: 25 Output: DC 15V 1500mA Installation: Surface Mount Connection Distance: Approx. 100m / 109.4yd Outdoor Unit: Camera: 1.0MP 1/4in CMOS, 3.6mm Lens Night Vision: 4 LED Infrared Lights Best Night Vision Distance: Approx. 0.2-1.0m / 0.66-3.28ft Camera Angle: 90 degrees Operating Temperature Range: -30-+60℃ Installation Method: Surface Mount Wiring Method: RVV4 Core Wire Connection. Package List: 1 x Outdoor Unit 1 x Indoor Unit 1 x Power Adapter 7 x Screws 7 x Screw Accessories 3 x Terminal Line 1 x Test Line 1 x Mounting Plate 1 x Manual Tool Kit (Wrench x 1, Screw x 1) 2 x English User Manual