2752 Wireless Wind Sensor Weather Station features Wireless digital system monitors wind speed and direction. Calculates heat index and wind chill. Receiver temperature range: 32 F to 122 F and 0 C to 50 C. Remote sensor temperature range: 4 F to 140 F and -20 C to 60 C. Indoor humidity range: 20 to 99%. 5 line LCD. Clock and calendar features. Minimum/maximum recall for indoor/outdoor temperature indoor humidity heat index and wind speed. Backlight feature for easy viewing. 200' transmission range. Mounting mast and hardware not included. 4 AA batteries required: 2 for receiver and 2 for remote sensor (batteries not included).