【Long transmission range】The hygrometer thermometer is connected to a radio transmitter which provides strong radio signal penetration (frequency 433MHz). The thermometer has a long transmission range (30-100m/98-328ft) in open area, the signal can be received quickly and timely in the transmission range. 【Multifunction】 Indoor and outdoor thermometer for healthy living, measures temperature and humidity values indoors and outdoors. Mainly used to measure temperature and humidity in homes, offices, workshops, etc. ☼【Accurate reading and large LCD screen】: Large LCD screen for easy and clear display. Indoor temperature (0-60°C/32-140°F) / outdoor temperature (-40°C-60°C/-40°F-140°F), humidity (10%-99%) and accuracy can reach ±1°C/±5% Automatic data change every 60 seconds (about 30 minutes for sensor to stabilize). 【Easy to Use】: The temperature can be easily changed with the button on the top units in Celsius or Fahrenheit. Please note that the batteries need to be reinstalled after