The working principle of this Tuya Wi-Fi emergency call button: connect the emergency button to the WiFi at home and add it to the Tuya smartphone application. When the elderly/patient/people who are inconvenient to move need help, they only need to press the call button. No matter where you are, your phone will receive alarm information, you can help your family as soon as possible<br> Small portable call buttons: The packaging contains double -sided tapes and tie cables; you can hang it on the neck with a lane, or you can use a double -sided tape on the wall. Anyone can operate the small -sized call button<br> Tuya Intelligent Application: Scan the QR code or search for "Tuya Smart" download application, you can add or delete the button in the application; delete the alarm in the application; implement multi -person sharing function in the application in the application<br> Multi -person sharing: Share with more family members through the sharing function of Tuya APP. After pressing the button, the person you share can also receive the alarm information so that multiple family members can participate<br> Multiple applicable places: family, nursing hospitals, hospitals, clinics, etc.;<br> Note: For stable signal receiving, please do not let the host from the WiFi signal.<br> Material: plastic<br> colour: As shown<br> Package Contents:<br> 1 * sos button<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.