Features: Wireless Smart Temperature Humidity Sensor -- 230Ft wirless transmission in open air, and low power consumption. Our long-range coverage enables its use in areas challenging for most residential Wi-Fi systems, such as basements, outdoor porch/patio areas, sheds, free-standing garages, even remote outbuildings on your property. Real-Time Enviroment Monitoring -- Be informed of the current temperature and humidity of critical equipment and rooms. APP Rmote Control -- With App which can display current temperature and humidity, with the app you can easy to control your home enviroment by adjust app connectted home appliances, such as air condition to adjust temperature or power on smart plug connected humidifier to promote living enviroment. Hub Free -- No hub required, just connect our smart temperature and humidity sensor with our wifi router and then add our devices to smart the app, you can use it freely without time and distance limited. Large LCD Monitor -- Large LCD display, with clear and large character easy to read even at long distances. Elegant white round edge design, good decor your home. Specification: Color: White Material: ABS Wireless Technology: WIFI Working Voltage: DC 4.5V ( 3 x AA battery not include) Transmission Frequency: 2.4GHz Low Power Indication: Yes Working Temperature and Humidity: -10℃ - 55℃, 0 - 100%RH Wireless Distance: 70M(open air)/Indoor 20M Size: 64 * 64 * 28mm Packing List: 1 * Wifi Smart Temperature Humidity Sensor