Taking care of the elderly and the sick is hard work. We hope we can help you to make life easier and better! Specifications: - Technical Parameters: SOS button (433Mhz, EV1527, 330K), WIFI hub (connect 433mhz sensors, connect 2.4G WIFI) - Work Mode: SOS send signal to wifi hub, wifi hub send smartphone notice via APP, also with local alarm voice and LED flicker - If your house big, suggest order more kits, let the sos button always connect with one of the hubs - SOS Battery: 1 unit 23A 12V battery (included), battery can work more than 6 months - WiFi Hub Power Supply: AC 110/220V, include 300mAh backup lithium battery, work more than 5 hours Package include: - wifi hub*1 - sos button*6 FAQ: - Q: How to make sure app get notification? - A: 1, Smartphone need connect wifi or with network of sim card 2, Open permission for the app in smartphone, keep app work in background of smartphone 3, When user press sos button, please press more times 4, Some smartphones can setup special notification music for different app, please try it 5, SOS button under the range of wifi hub - Q: Why can not connect wifi? - A: If the wifi hub connected wifi, and need change to another wifi, please delete the hub from app list first. - Q: How many smartphones can get notification same time? - A: The wifi hub can share to 20 app users, so 20 smartphones can get notification same time, but 1 app account only can login 1 smartphone, so different smartphone need register different app account. - Q: Power failure notification? - A: Yes, if the power supply of wifi hub failure, will get app notification. - Q: How to extend the coverage area between SOS button and wifi hub? - A: The signal signal amplifier will help you, also you can order more kits, let 1 SOS button connect more wifi hubs in different place of your house.