Vktech&reg; Multifunction 10 in 1 Outdoor Military Camping Survival Tool Compass Kit 10 functions in a compact tool: Flashlight, compass, thermometer, whistle, mirror, magnifying glass, and more It is a good tools for outdoor sports like hiking, camping, biking and spelunking Reflector: call for help in the countryside, reflect sunlight to sent out the light singnal. Whistle: call for help in countryside, sent out the sound signal Flint fire starter: survival by make fire (use tappet to push out flint form the second hole at the side)