Feature:1. HIGH RESOLUTION IMAGING: The smart door viewer offers 1080p high definition imaging, providing you with full control over front door dynamics anytime, anywhere for added peace of mind.2. NIGHT VISION TECHNOLOGY: Equipped with superior night vision functionality, this smart camera automatically turns on in the dark without disturbing your neighbors and remains unseen to the eye.3. ADVANCED HUMAN DETECTION SENSOR: With its excellent human detection sensor, the viewer camera uses superior digital algorithms to automatically catch and analyze incoming individuals for enhanced home security.4. 12 LANGUAGES SUPPORTED: The digital door viewer supports 12 different languages, including English, Chinese, Russian, French, Italian, German, Japanese, Korean, Czech, Turkish, Arabic, and Spanish.5. BUILT IN LARGE CAPACITY BATTERY: This home door viewer is constructed with durable plastic and electronic materials, featuring a built in 1400mAh rechargeable lithium battery that ensures a long battery life.Specification:Item Type: Smart Door Viewer CameraMaterial: Plastic + ElectronicsScreen Size: Approx. 3.97 inchesDoor Hole Installation Range: Approx. 15-35mm/0.6-1.37inDoor Thickness Installation Range: Approx. 35-100mm/1.37-3.93inmemory Card Slot: Supports up to 32GB memory expansion (not included)Battery Type: Built in 1400mAh polymer lithium battery (included).Package List:1 x Indoor Host (Display Screen)1 x Outdoor Camera6 x Screws1 x Stainless Steel Mounting Plate1 x Charging Cable1 x User Manual