The product uses a 3mm thick transparent acrylic plate as the thermometer dial, the watch core is covered with a stainless steel case and a 3m long double-sided tape. The product has a rainproof function, which can quickly and accurately measure the outdoor temperature How to use: wipe the glass of the door and glass, remove the double-sided adhesive product on the backing paper and stick the product on the outside of the window or glass. Close the window or door and you can read the outside temperature inside. Cleaning method: 3M double-sided tape is a plastic tie; you can remove the product from the plastic clip, remove the dirt on the dial, and then install the product.