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Specifications: Product name: 4.3 inch smart home wireless doorbell, security door with e-cat eyes Product size: 13.3 X 8.1 X 1.8cm/5.24 X 3.19 X 0.71in Product weight: 293g Product introduction: Use the existing door without breaking the door structure without the need of drilling, no wiring and installation can be used. The product is equipped with intelligent operating system and user-friendly design. It is easy for old and children to use, to protect your family security. Technical Support: LCD: 4.3in TFT color screen Angle of view: 145 degrees Camera: 300000 Applicable door thickness range: 35-110mm Applicable door hole range: 15-25mm Power supply: 1800mA lithium battery Indoor machine size: 134 X 82 X 13.5mm Package Includes: 1 X Digital Door Viewer 1 X Indoor Display Screen 1 X Product Instructions 1 X After-sale Service Card 6 X Screw 1 X Hanging Panel 1 X USB Data Line 1 X Certification 1 X Lithium Battery