Features: High definition 720P Camera Dual-Way Intercom. Perfect as a home security camera or a nanny cam for recording both picture and videos. Hands-free and available for Two-way intercom, better for communicate. Door thickness: 40-115mm (please measure door thickness before purchase). Suitable for door hole diameter: 14-50MM Loop Recording. Supports up to 32GB capacity for loop recording(No TF card included). With TF card inserted, the doorbell camera will record picture or video automatically. Easy to Install & Connect: You can install the Doorbell Camera without using any complicated tools. Screw tools for installation are provided in the package. The video doorbell camera has a built-in 3500 mAh battery. Using USB charging form, more convenient (for Depend on how many events trigger per day). Specifications: Material: Metal Screen Size: Approx. 130x95mm/5.12x3.74 inches for Cat Eye Size: Approx. 60x60mm/2.36x2.36 inches Processor: HI3518E Operating System: LiteOS Lens pixel: 720P Screen Specifications: 4.3-inch IPS LCD screen APP: Support Android/IOS Battery capacity: 3500Ah Maximum support 32G memory card Wide angle: 170 degrees Ambient temperature: -20℃ to 55℃ Language: English/Chinese Package Includes: 1 Piece Indoor Screen Host 1 Piece Outdoor for Cat Eye Machine 1 Piece Type-c Charging Cable 1 Piece Metal Hanging Board 1 Piece Screw Bag 1 Piece English Operation Guide note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.