An Inventsmart ZigBee Gateway Hub is a must to work with the Wifi Temperature Sensor, as well as a variety of ZigBee smart products, which is proved to be the bridge and control centre for smart homes and plays an irreplaceable role for all ZigBee products and realizes the whole intelligent linkage of your house. View history records in the App for smart controls for your house temperature and humidity. Monitor your house temperature and humidity no matter where you are. Designed with a low voltage monitoring reminder function in the App for real-time power supply for your sensor. Battery powered with long battery life. (Battery not included in the package.)