Applications mainly include: login and registration, adding equipment, visual intercom, video playback and so on. 1. Login registration: You can use your mobile phone number to register and log in before you can use the related functions of the APP. 2. Add equipment: There are several ways to add equipment. 3. Visual intercom: Click on the device in the device list on the home page to enter the video real-time intercom page, which has the functions of controlling the microphone and speaker, taking screenshots, recording videos, sharing devices and so on. 4. Video playback: If there is a TF card in the device, you can enter the video playback page from the real-time intercom page. You can select the date to be played back to get the video list, and click on the video to play back.