This pocket-sized flashlight is very portable. You can put it in your backpack or pocket, or clip it onto your pocket or hat when you need it to get bright light. There is also an adjustable wristband for your daily carrying. This pen flashlight is powered by two AA batteries (not included) and is readily available in almost all stores. Aerospace aluminum casings and military-grade anodizing help make tactical flashlights extremely durable and wear-resistant.