Product Description Remote Monitoring and Notification Alert - Remotely monitor temperature and humidity from your smart phone. Help keep an eye on your home when you're away from home. App will pushes you alert notifications once data is out of preset range. High Accuracy and No Interference - Temperature humidity built in high precision sensor. It can accesses temperature accurately within the deviation of 0.1? and 3% RH. Besides, it use radio transmitting circuit and coding technology, no signal interference. Dual Display Methods - Wireless digital indoor hygrometer thermometer is designed with clear LCD screen. You can check the current hygrometer thermometer on LCD display, also or you can get current and historical data via APP. Free Data Storage - It features 30-day on-board data storage. You can view recent temperature and humidity records freely. Easily track data - change by graph curve to display. Widely application and ZigBee 3.0 Hub - Widely used for nursery, bed room, wine cellar, green house, office, pet state, etc. This Smart Sensor need to work with ZigBee 3.0 Hub.