La Crosse Technology TX142TH Wireless Outdoor Thermo Hygrometer Transmitting Sensor Compatible with models 308-145, 308A-146, 308-146, 308-1451 and 308-1451H Wireless transmission of 200ft range (open air) Battery powered requires two AA batteries (not included) Measuring range: -40 F to 140 F (-40 C to 60 C) Outdoor humidity: 1% to 99% RH