The wireless sensor uses a transmission frequency of 433.92 MHz A host can connect up to 3 wireless sensors at the same time (a host is equipped with only one transmitter, if you want to realize this function, you need to purchase additional sensors) Host temperature measurement range: 0 C (14 F) - 60 C (140 F) Host humidity measurement range: 10 percent RH - 99 percent RH Sensor temperature measurement range: -40 C (-40 F)-60 C (140 F) Sensor humidity measurement range: 10 percent RH - 99 percent RH Large LCD Multifunction Weather StationThe weather station uses a large color LCD display, all the important information is clear at a glance: indoor and outdoor temperature (Celsius and Fahrenheit)/humidity, maximum/minimum temperature and alarms, weather forecast, comfort, time (12/24 hours), calendar, week( Seven the ... Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.