Features: 1.The 4.3in high?definition display with 300,000 pixels professional security cameras, and 105 ultra?wide angle allow you to capture details. 2.Built?in 1800mA lithium battery, support USB and mobile power (not included) power supply, convenient and advantageous to use. 3.Support about 35?110MM thickness door, and 15?25MM range door hole, better and accurately meet your demands. 4.Make use of smart energy?saving technology, automatic standby with one?click wake?up function, simple and fast to operate. 5.The smart video doorbell can effectively prevent peeping, allowing you to clearly know the situation outside the door, while ensuring your safety. Specification: Item Type: Video Doorbell Material: ABS Usage: Home, apartment, hotel LCD: 4.3in TFT color screen Viewing Angle: 105 Degrees Pixels: 300,000 Applicable Door Thickness Range: Approx. 35-110mm/1.4-4.3in Applicable Door Hole Range: Approx. 15-25mm/0.6-1.0in Power Supply: Built-in lithium battery, 3.7V 1800mAh PackageList: 1 x Outdoor Machine1 x Indoor Machine1 x USB Cable1 x Fixed Plate10 x Screw1 x Manual