The 5v AC adaptor has a number of benefits that will attract potential buyers. In the first instance it is universally compatible and means you can feed a whole variety of devices all from one unit, allowing you some relief from the demand that running one device at any given time should now be linked to carrying another. Secondly, the adaptor's high energy efficiency permits it to save power--and consequentially money in monthly electric bills--over an extended period of time. Thirdly, its safety features built in protection (such as surge protection) protect your device and appliances from damage by voltage spikes. This can possibly cause you to lay out some unnecessary maintenance or purchase costly replacements for equipment that costs hundreds of dollars expensive. At the same time, its portability lets you take your energy with you, allowing one to enumerate most of these advantages off the cuff. In a word, choosing a 5v AC adaptor not only secures stable power for everyday use but also makes it affordable and safe.