1、WiFi Door Viewer: This smart door viewer can be connected to WiFi router, supports dual way intercom, viewing visitors, video calls, snapshots, recording, etc., the system function menu is located on the mobile APP, widely used in home, apartment, villa, hotel, or office room. 2、Multiple Functions: The smart door bell adopts 1080P camera with a wide viewing angle, automatically switching day and night vision sensitivity (adjustable, distance of about 2m), using TFT color display screen, PIR motion sensor to automatically detect movement, push messages and videos. 3、Language and Storage: The visual door viewer supports both English and Chinese. After downloading the APP, the language selection will be displayed. You can choose and set the appropriate language according to your country, with a maximum support of 128GB micro memory card(not included). 4、Convenient Use: Press and hold the reset button for a few seconds, then point the QR code on the mobile APP towards the door bell and recognize it. Press and hold the language prompt to enter the next step, avoiding WiFi username length exceeding 32 characters or containing special symbols. 5、Power Supply Method: This WiFi video door bell has built in 5000mAh lithium ion battery, supports 30 days of standby time (usually 3‑5 calls per day), with low battery level reminder, and USB USB cable for convenient charging. Item Type: Smart Visual Door Bell Material: ABS Main Chip: For Ingenic T31 Operating System: For LiteOS Viewing Angle: D=166.9°, H=137.4° Camera Pixel: 1080P Display Screen: 4.3 Inch, 480x272 Battery Capacity: 5000mAh Lithium Ion Battery (built in battery) Dual Way Audio: Support Motion Detection: Support Infrared LED Wavelength: 850nm Battery Charger: 5V 2A Door Peephole: Approx. 14-28mm / 0.6-1.1in Door Thickness: Approx. 35-120mm / 1.4-4.7in External Storage: Micro Memory Card (up to 128G) (card not included) Wireless WIFI: ieee802.11b/g/n 2.4GHZ 1 x Monitor 1 x Door Bell 4 x Screws 1 x USB Cable 1 x User Manual