Wide Transmission RangeThe hygrometer thermometer is linked with a radio transmitter which provides strong wireless signal penetration (433MHz 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 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 display 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 put data every 60 seconds (about 30 minutes to stabilize the sensor). Easy to use: It is easy to change with the button on the top on temperature units in Celsius or Fahrenheit. Please note that batteries need to be re-installed after changing C / F temperature units. Portable Design & Easy Installation: With wall bracket and retractable bracket on the back, easy to mount on the wall or on the table. Digital hygrometer thermometer is an ideal life partner for your family.