Digital LCD Indoor Outdoor Thermometer w/Hygrometer #5 Outdoor Temperature range: -50C ~70C (-58F~158F). Indoor temperature range: 0C~50C (32F~122F). Precise: 0.1C. Humidity range: 25%RH~98%RH, the outdoor humidity can display on the screen when you are out; the indoor humidity can display on the screen when you are in, but they are not display at the same time. Powered by one AAA battery.(NOT INCLUDED)