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% RH - 99% RH; Sensor temperature measurement range: -40 C (-40 F)-60 C (140 F); Sensor humidity measurement range: 10% RH - 99% 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.