【Large 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/98-328ft) in the open area, the signal can be received quickly and in time within the transmission area. 【Multi-function】Indoor and outdoor thermometer for healthy life, measures indoor and outdoor temperature and humidity values. Mainly used to measure temperature and humidity in homes, offices, workshops, etc. 【Accurate Reading Large LCD Display】: Large LCD display 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 the data every 60 seconds (about 30 minutes to stabilize the sensor). 【Easy to use】: It is easy to switch with the button on the top on the temperature units in Celsius or Fahrenheit. Please note that the batteries need to