Long transmission rangethermometer hygrometer 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 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 displayLarge LCD display for easy and clear viewing. Indoor temperature (0-60C/32-140F) / Outdoor temperature (-40C-60C/-40F-140F), Humidity (10%-99%) and the accuracy can reach 1C/ 5% Automatically put the data every 60 seconds (about 30 minutes to stabilize the sensor).Easy to useIt is easy to change with the button on the top the temperature units in Celsius or Fahrenheit. Please note that batteries need to be installed again after changing C/F temperature units.Portable design & easy installation Wireless indoor outdoor thermometer with wall mount and retractable stand on the back, easy to mount on the wall or put on the table. Digital hygrometer thermometer is an ideal life partner for your family.