1. LCD screen: The 2.8 - inch screen allows you to easily see the visitor's face. This makes it safer and more convenient. 2. Built - in memory: With the built - in memory, photos are saved in a circular manner without the need for a memory card. 3. Wide viewing angle: The 90 - degree wide - angle lens enables you to see a larger picture without missing your friends. When a visitor presses the doorbell, the room host will ring and the LCD screen will light up for taking a photo. In safe mode, you can also press the power button to take a photo. Easily create visitor records. 4. Power mode: It is powered by 4 AAA batteries (not included). You just need to open the battery compartment cover on the side of the room host without removing the doorbell. 5. Other functions: Photo browsing, security status setting, and deletion of visitor records. Thank you for purchasing products from the High Quality store and have a pleasant day!