This Wireless Remote Temperature and Humidity Sensor from Meade is a 3-channel LCD Display temperature & humidity sensor for use with all Meade weather stations except the TE109NL-M, RCW33W-M and TE278W-M. This TS33C-M remote sensor transmits up to 100 feet / 30 meters on one of three transmission channels. The built in LCD display shows the temperature and humidity in either user-selected Celsius or Fahrenheit. The indoor/outdoor humidity range is 25-90%. It is wall mountable. Two user-supplied AA batteries are required. The suggested operating temperature range is -40 to 122&dge; F / -40 to +50° C when using lithium type batteries.