Convenience In Your Pocket! Fenix's First USB Rechargeable LED Flashlight! Like the thumb drive when they first came out, just plug this in, charge it, and go.  What could be more convenient?  The Fenix UC40 is more than just a USB rechargeable flashlight, it is also can be used safely with various batteries.  So, when you don't have access to that USB outlet, just pop in some batteries, and your ready.  This is a long-reaching light built for biking, camping, climbing, travel, etc.