Hausbell Alarm Home Security System,3G & WiFi 2in1 Wireless Smart GSM Security Alarm 433MHz GSM Home&Business Office with Full Touch Screen, Auto Dial and APP Remote Control DIY Kits APP Control Remote operation: Free IOS/Andriod APP remote control home alarm system,so you onle need a smart phone to control the alarm host. 3G GSM/Wifi Support: Insert a 3G SIM card into the alarm system and save your phone number on it,then it will send message or call your cell phone when alarm alerts. And it will push alarm notification via free app when it is triggered.(It just support 2.4g wifi, not 5g). Double guarantee Easy Operation: TFT color touch screen, voice prompt design during setting,with which the young and old can use it easily Built-in rechargeable battery - Built in 3.7V 800mAh rechargeable lithium battery that can last about 6-8 hours with full power,when the home alarm system host power-off,the rechargeable battery automatic start work Customer Service: 12-month warranty, professional technical support and friendly responsive customer service within 24 hours