Built-in large capacity rechargable lithium battery to supplys power, and you can recharge it in time. Large Display: Large color screen allows you to browse the data more clearly, makes it more convenient for elderly and children, giving you a better experience. Wide Applications: This detector is suitable for indoor air quality detecting, and can be widely used in your home, living room, bedroom, office and other places. Intelligent Linkage:You can achieve intelligent linkage through Tuya APP. After setting, you can acchieve the intelligent linkage such as when the temperature up to 34 , automatically open the door. After connect with your mobpilephone APP correctly, you can view the data on your mobilephone easily, wherever you are.