Waterproof and self-adhesive: The transparent temperature gauge is waterproof and can firmly stick to the window or door, you don't need to worry about moisture or water. Removable and easy installation: The waterproof thermometer is removable for cleaning and recalibration, just stick it to the window after removing the protective film. Accurate and precise: The self-adhesive thermometer built-in highly sensitive precision bimetallic strips will accurately reflect the rapidly changing temperature to let you know the weather conditions. Multifunctional weather monitor: This window temperature gauge can be mounted on an outdoor window, you can clearly know the temperature outside at home and change clothes according to the displayed data. No battery required: The outdoor window thermometer is economical, battery-free, environmentally friendly, and can be easily installed on the window with a sticker.