Brinno PHV1330 Hidden Front Door Camera Uses a 3 inch LCD panel and a micro SD slot to display who is at your door and capture the image without alerting them to your presence (2 GB micro SD card is not included) Simply push the button to display and record a large image of the person outside your door Compensates for low-light images and eliminates "fish eye" distortion Optional Knocking Sensor and Motion Sensor allow photos to be taken automatically, even when you're away Turns off automatically after 10 seconds to conserve battery life