Cloud storage is more secure: Free video cloud storage can be more secure and more convenient to view cloud storage videos at any time. Storage from the latest 3 Days in a loop. The 4th day video will replace the first day video, you will always have 3 days record with Cloud Service for free. No TF memory card is required. 2.4GHz Wi-Fi network: The range of 2.4GHz Wi-Fi signal is about 20 meters. You can easily connect to the home Wi-Fi network, and then send the real-time video to the mobile phone. People can watch videos on the phone anytime, anywhere. Family contact and real-time sharing: phones can monitor and share doorbell images at the same time, but only one user can talk directly on the walkie-talkie. Compatible with iOS and Android operating systems. PIR motion detection: When someone rings the doorbell, your phone will immediately receive a notification. You can open the door remotely through the Aiwit app and communicate directly through your mobile phone. 166-degree wide-angle lens: A 166-degree wide-angle lens is installed to provide a clear and wide field of view outside the door.