[℃ / ℉ One Key Switching, Max/Min Record Display] There are three convenient and practical buttons on the back of the product. Press the set key in the middle to switch ℃ / ℉. Press the bracket to the hanging hole on the back of the product and push the bracket upward,then the product can be placed on the platform surface such as table and bookshelf.Stick the wall sticker to the wall with double-sided adhesive tape, align the hanging hole on the back of the product with the wall sticker, push down the product, and then fix it.