Bought this for my son to use at school. I refrigerate overnight and it leaves his water cold all day. Now the temperature reader doesn't work anymore. I assume either it's already broke or it just needs a battery but it died after only 3 weeks of use. Got this on sale for a great price .There's a weird smell coming from the battery.No way to change battery in lid. Directions not written in English.Good quality, easy to use, and easy to clean. I would have given it a 5 star rating, but no where in the description does it say it ONLY displays Celsius. I guess that’s not a flaw of the product per say , but of the description of the product.It won’t work, instructions aren’t in EnglishI gave this item as a gift and my brother loved it! It is just the right size for bag pockets as wellIt stopped showing temperature. Waste of money and timeWater sticks to the lid, which drips across the surface.