Features: 1.NIGHT VISION FUNCTION: This doorbell has super strong night vision function, with no light, no sensation, no heat, no exposure, and no catch; High strength alloy 2MP, 1080P HD, ultra wide angle 135 . 2.3.97IN HD DISPLAY: Equipped with a 3.97 inch HD display screen, with a novel angular appearance, 4x zoom, unlimited focus. 3.HUMAN BODY DETECTION SENSOR: Ultra digital algorithm human body detection sensor, automatically capturing foreign personnel, and automatically analyzing sensing; The super large and thick 304 stainless steel suspension plate can support a maximum of 40mm gate control. 4.12 LANGUAGES: Digital gate viewer supports 12 languages, including English, Chinese, Russian, French, Italian, German, Japanese, Korean, Czech, Turkish, Arabic, and Spanish. 5.BUILT IN LARGE CAPACITY LITHIUM BATTERY: Home video doorbell is made of plastic and electronic materials, with a built in 3800mAh rechargeable lithium battery, providing a long battery life. specification:Item Type: Smart Doorbell Mode: A9 Material: Plastic, Electronics Screen Size: 3.97 inches Pixel: 2MP Visual Angle: 135 Memory Card Slot: Supports up to 32GB memory expansion (not included) Automatic Loop Coverage: Supported Color Night Vision: Supported (color, black and white night vision optional) Human Body Sensing Function: Support Automatic Catch: Supported Sound Recording: Supported Screen Playback of Video Photos: Supported Mobile Remote Viewing: Not Supported Battery Type: Built in 3800mAh lithium battery (included) PackageList: 1 x Indoor Unit (Monitor Screen) 1 x Outdoor Camera 6 x Screw 1 x Stainless Steel Hanging Plate 1 x Charging Cable 1 x Manual