The blue light from the 4 in 1 LED Flashlight can be seen from 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 for personal security to scare off an attacker or to summon help if someone were to got lost while hiking in a remote location. It is small and light weight enough to be carried on your key chain so you will always have it with you. Batteries included.