Open the APP and click on the plus button/scan button in the upper right corner, and follow the prompts to add devices: 1. For Vitals Detection Radar/Fall Detection Radar, please scan the SN code. 2. For Smart Watch, please scan QR code in: watch-settings. 3. For SOS Button, please scan the QR code after opening the back cover.

There is currently no upper limit.

Please refer to the personal homepage in the APP - About Us -"Terms of Service".