Feature: 1. Human Motion Detection: When someone approaches the door 1‑2 meters for about 2 seconds, it will automatically take pictures or save videos, preventing thieves. 2. HD Night Vision: The security camera adopts high definition infrared night vision technology, day and night guard, professional security level. 3. 4.5in LCD Display: 170 degree wide angle design, you can see the panorama. The 4.5inch high definition large screen makes everything outside the door clearer. 4. Convenient Operation: Wake up with one key, press the watch button at any time, you can view the scene in real time, and press it again to record. 5. Durable Construction: Zinc alloy shell, rustproof and durable, effectively prevent external impact and damage. Stable operating system, brand new user experience. Specification: Item Type: Video Doorbell Material: ABS, zinc alloy Screen Size: 4.5 inches Camera Pixel: 2MP CMOS Operation Mode: Button type Viewing Angle: 170° Photo/Video: Supported Output Format: JPG/AVI Storage Type: Memory Card Power Supply Mode: Lithium battery Camera: Day and night professional security level Motion Detection: Support (1-2m/3.28-6.56ft) Doorbell Sounds: Six Polyphonic Ringtones Applicable Door Thickness: Approx. 35-110mm/1.38-4.33inApplicable Door Hole Range: Approx. 14-50mm/0.55-1.97in Battery Type: 1 x 3.7V 3500mAh lithium battery (included) Battery Model: BL5C Uses: Suitable for families, apartments, office buildings, hotels and other places, iron doors, wooden doors, antitheft doors, etc. can be installed. Package List: 1 x Camera1 x Monitor1 x Mounting Plate6 x Screw1 x USB Cable1 x Manual Note: Do not place the product in excessively corrosive, humid and high temperature environments.