【Long transmission range】The hygrometer thermometer is connected to a radio transmitter which provides strong wireless signal penetration (433 MHz frequency). The thermometer has a wide transmission range (30-100 m/98-328 ft) in the open area, the signal can be received quickly and on time within the transmission area. 【Multifunction】 Indoor and outdoor thermometer for healthy living, measures indoor and outdoor temperature and humidity values. Mainly used for measuring temperature and humidity in homes, offices, workshops, etc. ☼【Accurate Reading & Large LCD Display】Large LCD screen for easy and clear viewing. Indoor temperature (0-60°C/32-140°F) / Outdoor temperature (-40°C-60°C/-40°F-140°F), Humidity (10%-99%) and the accuracy can reach ±1°C/±5% Automatically update data every 60 seconds (about 30 minutes to stabilize the sensor). ☂【Easy to use】 : It is easy to change the temperature units to Celsius or Fahrenheit with the button on the top. Please note that the batteries must be