Waterproof metal structure and acrylic enamel, will not rust, adapts to the four seasons and withstands any weather | Temperature ranges from -40 to 60 °C, -40 to 140 °F, both °C and °F | Numbers are easy to read from a long distance with a light colored background, and beautiful to look at | Battery-free, built-in thermometer, will automatically sense and accurately measure within 3 hours | Detachable design, can be hung in outdoor and indoor spaces. Such as garden, yard, grass or other places you want