Features: 4.3 inch LCD monitor with Chinese/English menu and clock display. In-door ringtone remind. PIR motion detection start time can be adjustable.(0s, 1s, 3s, 5s optional) With IR night vision function,the night vision can be clearly seen. PIR anti-theft function, providing active wake-up function. Automatic photo/audio video recording. (Not only video recording, but also audio recording) Power off memory.(There is no need to reset the time and ring tone when replacing the battery. Restoring the power supply within 24 hours automatically restore the correct time.) No wiring required, battery powered, visual intercom, simple installation; It can also be powered by electricity. You can talk to visitors smoothly at any time and any place. Specification: Socket Type: UK Plug 110-240V, US Plug 110-240V, EU Plug 110-240V, AU Plug 110-240V (Optional) LCD Resolution: 480 * 272 Power: built-in 8000mAh lithium-ion battery, standby time is about 180 days Battery Alarm: Support Camera: HD 1 million pixels Video Format: AVI Image Format: JPG Screen: 4.3 inch TFT color LCD screen Memory Card: Max support 32G Door Thickness: 35mm-95mm Door Hole Diameter: 15mm-60mm Viewing Angle: 160 degrees Indoor Machine Size: 142 * 102 * 20mm/5.6 * 4.0 * 0.8in Outdoor Unit Size: 65 * 65 * 18mm/2.6 * 2.6 * 0.7in Package Weight: Approx. 726g/25.6oz Package list: 1 * 4.3 inch LCD Monitor 1 * Doorbell 1 * Charger 1 * Screws Package 1 * User Manual 1、4.3 inch LCD monitor with Chinese/English menu and clock display. In-door ringtone remind. 2、PIR motion detection start time can be adjustable.(0s, 1s, 3s, 5s optional) 3、With IR night vision function,the night vision can be clearly seen. 4、PIR anti-theft function, providing active wake-up function. 5、Automatic photo/audio video recording. (Not only video recording, but also audio recording)