La Crosse Technology Indoor/Outdoor Temperature Digital Thermometer Digital thermometer with wireless remote and clock.Display: 3.31" L x 0.89" W x 5.87" H,Sensor: 1.50" L x 0.83" W x 5.00" H Remote sensor transmits from up to 330 feet; records daily high and low temperatures Receives weather data from up to 3 sensors (other remotes sold separately) Temperatures displayed in either Fahrenheit or Celsius; 12/24-hour time display Display/receiver measures 5.86 by 3.3 inches inches; remote sensor: 5 by 1.5 inches The outside transmitter takes 2 AA batteries Mount the outdoor transmitter on a North-facing wall or in any well shaded area. Under an eave or deck rail is preferred. The maximum transmitting range to the temperature station is over 330-feet (100 meters) in open air, not including walls