Stylish useful New Digital LCD Outdoor/Indoor Temperature Holder Thermometer Clock Temperature Range Indoor: -10 - +50 (+14F - +122F) Outdoor-50 +70 (-58F - +158F) . Power-supply: 1.5VDC Functions: indoor & outdoor temperature display, time display temperature unit C and F changeable. With back holder design,you could put it on your desk or hang it on the wall Take out the battery about 2 seconds and reinstall it if any abnormal display appears. Put the replaced battery at places appointed by Government.