No need for batteries – here comes the sun! Solar-powered temperature measurement. no batteries required – powered by solar cells works for 72 hours without light fast and accurate temperature measurement in just 9 seconds flexible tip fever alarm anti-allergic (no nickel) high accuracy (+/- 0.1 °C) extra-large, easy-to-read display memory beeps when ready switches off automatically provided with protective case patented worldwide measuring range: 32.0 °C – 43.9 °C