This flashlight is a bright white light for nighttime use while hiking, camping, fishing, etc. It also has built-in UV Blacklight, useful for spotting pet pee, scorpions, and fake money. Note in my photo that the USA 20 dollar bill has a strip that's invisible under normal light but shows under UV. You have seen clerks at the store using a small light to check your cash, I am sure. Now you can check bills yourself. Very nice feature.
The light is powered using either 3-AAA batteries or by a rechargeable 18650 battery (which I will be using). Well worth the small cost. Finding one counterfeit bill and it pays for itself.