Feature: 164ft Remote Working Range -- Wirless transmission range up to 164ft(50m) which enables it use in most areas such as basements, outdoor porch/patio areas, sheds, free-standing garages, even remote outbuildings on your property. Hub Required Required App Remote Control -- A zigbee gateway is required to connect the Humidity Temperature Sensor via smartphone app. Zigbee Gateway Please buy apart. Smart Alert & Automate Your Appliances -- As the temperature and humidity of your room is changed, throgh the app, your app connected air condition, humidifier, etc will auto working to adapt to environmental changes. Wide Application -- By automate humidifier/dehumidifier, air condition etc, great to balance the living condition, storage condition or greenhouse plant growth conditions etc. High Accurate Monitor -- With built-in high sensitivity sensor, it provides high precise monitoring. Temperature range: -10-55 Humidity range: 0-99.9%RH. The temperature is accurate to 0.5, while humidity is 5%RH. Specification: Color: White Material: PC Wireless Technology: ZigBee Transmission Frequency: 2.4GHz Transmitting Power: 15dBm Communication Distance: 50m/164FT (Open Environment) Working Voltage: DC 3V Working Current: 30mA Standby Current: 30A Low Voltage Alarm Value: 2.2V(0.2V) Battery Life: More than 1 year Operating Temperature: -10-55 Temperature Error: 1 Humidity Error: 5% Installation Method: Wall Hanging, Stand, Paste Power Supply: 2 * AAA Battery (Not Included) Item Size: Approx. 6.1*6.1*2.3cm / 2.4*2.4*0.91in Item Weight: Approx. 47.1g / 1.66oz Packing List: 1 * Wifi Smart Thermometer Hygrometer 1 * 3M Glue 1 * Host 1 * User Manual