La Crosse Technology K84377 Outdoor Window Thermometer Displays IN/OUT temperature with MIN/MAX records (F) Attaches to glass on the outside or inside of a window or door MINIMUM Record Resets Daily at 8:00 PM; MAXIMUM Record Daily at 8:00AM Outdoor Use temp range: -13 F to 158 F; Indoor Use temp range: +32F to 94F Included LR44 1.5V button cell battery