Infrared night vision,doorbell sound,photo taking function Built-in memory,circular storage,no need to insert card Minimalist design,easy to operate 300,000 Pixels Professional security HD cameras lens 90 degrees wide Angle,super long standby Model:DD1 Screen Size:2.8 inch Screen Resolution Ratio:320*240 Storage Mode:Built-In Memory,Circular Storage Battery:4x1.5V AAA(Not Including) Camera:300,000 Pixels Infrared Lamps:2x850nm Visual Angle:90° Suitable Door Hole Diameter:14-22mm/0.55-0.87 inch Suitable Door Thickness:35-120mm/1.38-4.72 inch Product Size: Indoor Machine:127x68x13mm/5x2.68x0.51 inch Outdoor Parts:Diameter 58x13mm/2.28x0.51 inch Operating Environment:20°C-55°C Color:Silver material:plastic Package Contents: 1* indoor street 1* outdoor unit 1* bracket 1 pack of screws 1* manual Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.