No professional knowledge is required, and it can be installed in a few minutes. Just fix the alarm host to the wall (screws included), insert the Micro-C data cable, and it can be turned on. Built-in backup battery for emergency use 4.3-inch IPS capacitive touch screen, simple style, sensitive response speed, enhance the user experience. Elderly and children can also operate it easily. Support setting different color themes Support 2G SIM card and 2.4GHz Wi-Fi. After inserting the SIM card, the alarm system can operate normally even if the Wi-Fi is disconnected. // Can be used with Tuya Smart and Smart Life applications, you can operate them anytime, anywhere through the application. In addition, when the sensor is triggered, you will receive real-time notifications through the application You can set the scheduled arming and disarming settings on the alarm host or the app to avoid repeated operations and save time. It supports the expansion of up to 200 accessories, such as motion detectors, door and window sensors, and other accessories that work with Tuya and Smart Life apps This alarm system is the best tool to stop thieves from breaking in. It supports presetting up to 5 groups of phone numbers. When the sensor is triggered, the alarm system will emit a sound of more than 120 dB to scare away the intruder, and automatically dial your phone number and send you an alarm message. If the phone number is busy, it will automatically dial the next number so you don't miss any important information Hign-concerned Chemical:None Zone Number:99 Connection Type:Wireless Arming Type:APP (The product printed words may vary depending on the batch, but this does not affect use) Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the United States, the Philippines,Taiwan and so on. Voltage:AC110V Color