Brinno PHVMAC Motion Activated Hidden Front Door Camera Motion sensing viewer uses a 3 inch LCD panel to display who is at your door without alerting them to your presence Images are captured and stored on the included 4GB micro SD card whether you're home or not Images can be reviewed on-screen with the push of a button Zoom feature enlarges the center of the image for viewing facial details Includes 4GB micro SD card and 4 AA batteries, which last approximately 9,000 activations