USB is virtually universal, now your logo can be as well.
Just about any electronic device you get today has the potential to be USB powered. The trend toward items that are USB powered has developed over time because promotional USB powered items as well as any other USB powered items use a port that is basically now universal. You can plug them in to car chargers, computers, and sometimes even into a television set. USEB power is not likely to go anywhere any time soon and it has the added benefit of allowing you to unplug a device while it’s “hot” without damaging anything, unlike other power heads that have to be unplugged “cold”.