Physical sensing principle, no battery, easyto use There is double-sided tape on the back of the thermometer, which can be pasted directly on the wall for easyinstallation Dialdisplay, easyto observe temperature and humidity changes A thermometer measures both temperature and humidity Temperature range: 60-120℉ / 16-49℃ Humidity range: 0-100 Color printing, clear scale Small and, portable environmental, noteasy to damage, Manufacturer: CAZSTYK