The La Crosse Technology's Wireless Weather Thermometer station features indoor/outdoor temperature readings, indoor humidity, hi/lo temperature records and trend indicators all on an easy-to-read tabletop display. Long distance wireless transmission between the sensor and home station ranges up to 300 ft. and the sensor can read outside temperatures down to -40 deg. F. Time display is adjustable in either 12-hour standard or 24-hour time format and versatile temperature readings in Fahrenheit or Celsius. This battery-operated station with included sensor requires 2 AAA and 2 AA batteries (not included) and will give you your weather at a glance! Stay updated on when to change batteries with the built-in low battery indicator. Battery life for the display is up to 12 months and the outdoor sensor works for up to 24 months.