Excelity&reg;10 Functions Pocket Size Compact Kit: Thermometer, Hygrometer, LED Light, Reflector, Spirit Level, Compass, Whistle, Flint, Magnifier, Ruler 10 functions in a compact kit: thermometer, hygrometer, LED light, reflector, spirit level, compass, whistle, flint, magnifier, ruler The LED light uses CR1220 battery (included) Handy for hiking, camping, spelunking, etc Suitable for adventurist,campng,outdoor sport