Wireless Outdoor Remote Sensor, 100 Foot Range, Weatherproof Case, Wireless Balance Point for Heat Pumps, User Selectable Balance Point, Displays Outdoor Temperature, Requires:T955W(Not Included), Batteries Powered: 2AA, Dims: 6-1/8"H X 2-3/8"W X 1"D, Made in PRC, Alt Number: 411083