Features 3.97 INCH DISPLAY: Equipped with 3.97 inch high definition LCD display screen, adopts high power infrared fill light, ensuring good night vision effect. CAMERA PARAMETER: The camera has a resolution of 1080P, 2MP pixels. WIDE VIEW: A wide viewing angle of 135°, allowing you to see every detail in the image. MULTIPLE FUNCTIONS: With night vision, 1080P camera resolution, and adjustable focal length, etc. APPLICABLE SIZE: Suitable for 15‑30mm door hole, 35‑80mm door thickness. After installing the outdoor camera and indoor display, it can work normally. Specification:Item Type: Video Door Bell Screen Size: 3.97 Inch Screen Resolution: 480 x 800 Camera Resolution: 1080P; Internal Storage: 720P Camera Pixel: 2MP Wide Angle: 135° Infrared Light: 2 Storage Method: Micro Memory Card, support more than 8G memory card, 16G 32G recommended (memory card not included) Language Support: English, Chinese, Russian, French, Italian, German, Japanese, Korean, Czech, Turkish, Arabic Suitable Door Hole: Approx. 15-30mm / 0.6-1.2in Suitable Door Thickness: Approx. 35-80mm / 1.4-3.1in Battery Type: 3.7-4.2V 1400mAh Lithium Ion Battery (built in battery) Charging Interface: Type C Screen Size: Approx. 134.5 x 76 x 13mm / 5.3 x 3 x 0.5in Package List:1 x Indoor Unit 1 x Camera 1 x USB Cable 1 x Mounting Plate 6 x Screws 1 x English User Manual Package List 1 x Indoor Unit 1 x Camera 1 x USB Cable 1 x Mounting Plate 6 x Screws 1 x English User Manual