The iTP R01 is a pretty cool little light and is the only high powered rechargeable one I have ever seen that is meant to charge off of a USB cord. If you are like me, you probably have a hundred little adapters from cell phones and other devices that will let you charge it in a regular wall socket and probably a car cigarette outlet as well.
The R01 was meant to be a simple light, with only one mode and no other fancy features. Police officer customers of ours have been really pleased with the light, since they can keep it charged for duty and it is brighter and more compact than what they are used to. No extra modes means that they do not have to do any cycling to get to the high brightness, so it is always at maximum output when you need it to be.
Here it is in action: