La Crosse Technology 327-1414W Color Wireless Wind Speed Weather Station, Black Wind Measurements (avg & top mph) of speed and historical records Full-color bright LED with adjustable backlight (hi/lo/off) (display Uses 3 AAA batteries) sensor Uses 2 C batteries Combination wireless outdoor sensor transmits within 300 ft (open air) Adjustable alerts for wind speed, indoor & outdoor temperature and humidity Atomic self-setting time & date with auto reset for daylight saving time