1,Visual ,Nightvision 2,Doorbell,TF card slot 3,Photo shooting 4,3.0inch 940x240 TFT 5,Zoom function Zoom function door viewer with 3.0inch Product Functions:1. Visual + Nightvision + Doorbell + TF card slot + Photo shooting2. LCD Screen size: 3.0inch 940x240 TFT3. Camera sensor: 300,000 pixels4. Optical lens: view angle 70 degrees5. Zoom function6. TF card slot (card not included), 1GB can store ...