The blue light from the 4-in-1 LED flashlight can be seen over a mile away and produces enough light to illuminate an entire room at night. But this unit is much more than just a water resistant, powerful, mini flashlight. It can be unscrewed in the middle to reveal a small hidden compartment which is great for storing medicine. The bottom of the unit contains a built-in whistle which can be used to scare off an attacker or summon help if someone were to get lost while hiking in a remote location. It is small and lightweight enough to be carried on your key chain so you will always have it with you. Batteries included.