Window Thermometer, Large Digits For Great Viewing, Displays Current Outside Temperature & Min/Max Temperature Values, Automatically Resets & Is Weather Resistant, Min/ Max Record Resets Daily At 8:00 PM, Weather Resistant Case Attaches To Glass On The Outside Of A Window Or Door, Low Battery Icon Notifies To Change The Batteries, Specifications: Temperature Range: -22 Fahrenheit Degrees To 122 Fahrenheit Degrees, Temperature Accuracy: +/- 1.5 Fahrenheit Degrees, Current & Min/Max Temperatures Every 10 Seconds, Power Requirements: 1 "AAA" Alkaline Battery, Not Included.