Waterproof and Sticky: The transparent temperature meter is waterproof and can stick tightly to the window or door, no need to worry about moisture or water Detachable and Simple Assembly: The waterproof thermometer is detachable for cleaning and recalibrating, just stick it on the window after tearing off the protective film Precise and Accurate: 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 monitor can be mounted on an outdoor window, you can clearly know the temperature outside at home and change your 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