USB has made it convenient to charge mobile devices, since most people also have access to a computer with an available port. But as the devices add up, those ports become scarce. This is ideal during extended travel, when battery power for items like the Apple iPad or iPhone runs low after a movie. Keeping fully charged is a challenge while traveling, since most people leave their bulky systems at home. This is where a portable USB charge adapter comes in very handy. In this article, Benchmark Reviews tests the travel-sized Arctic USB Charger PRO 4 Rev 2, model PSAEQ-AC01301-BL.