La Crosse Technology WS-9013U-CBP Wireless Temperature Station Sensitive wireless temperature station from industry leader La Crosse Technology Station's LCD monitor conveys indoor and outdoor temperature conditions and time of day; wall-mount or stand alone display Included TX6U sensor transmits information to base from distances up to 80 feet Requires 4 AA alkaline batteries (not included) The base monitor measures 5-2/3 by 3-1/4 by 1-1/4 inches, the sensor 5 by 1-3/5 by 4/5 inches