Fangrui Product Details About This Item: How This Tuya Wi-fi Call Button Work: Connect The Button To Your Wifi And Add It To The Tuya Smartphone App. When The Elderly/patient/person With Limited Mobility Needs Help, They Just Need To The Call Button. No Matter Where You Are, Your Phone Can Receive An Alarm Message, And You Can Go To Help Your Family In The First Time Small Size And Portable Call Button: Can Be Hung On The Neck With A Lanyard Or Pasted With Double-sided Tape, Small Size Call Button Anyone Can Operate It Tuya Smart App Control: Scan The Qr Code Or Search For Tuya Smart To Download App, You Can Add Or Remove Buttons In The App; Remove Alerts In The App; Implement Multi Person Sharing Function In The App Mutiple People Sharing: Share With More Family Members Through The Sharing Function In Tuya App. After Pressing The Button, The Person You Shared Can Also Receive Alarm Messages, So That Multiple Family Members Can Participate Product Name: Wifi Sos Call Button Power: Built-in Battery Charging