Great transmission range The hygrometer thermometer is connected to a radio transmitter which offers strong penetration of the wireless signal (433 MHz frequency). The thermometer has a wide transmission range (30-100m/98-328ft) in the open area, the signal can be received quickly and in time in the transmission area. Multi-function indoor and outdoor thermometer for healthy living, measures temperature and humidity values indoors and outdoors. 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 (0-60C/32-140F) / Outdoor Temperature (-40C-60C/-40F-140F), Humidity (10%-99%) and accuracy can reach 1C/5% Automatically update data every 60 seconds (about 30 minutes to stabilize the sensor). Easy to use: it is easy to change with the button at the top on the temperature units in Celsius or Fahrenheit. Please note that batteries need to be reinstalled after changing C / F temperature units. Portable Design & Easy Installation: With wall mount and retractable stand at the rear, easy to mount on the wall or put on the table. Digital hygrometer thermometer is an ideal life partner for your family. 6*7.5cm