As travelers are stowing their electronics along for their trips, their charging needs have become more crucial. According to the PR Newswire Association, 81 percent of a study group said their smartphone is their primary travel accessory. Most people juggle several mobile devices, including laptops, tablets and e-readers.

With plenty of electronic devices, hotels must provide enough outlets to cover all the chargers. But appliances already in the room, like lamps and a bedside clock, may take up several outlets. Conveniently placed ones are what pleases guests. Additional tech provided by the hotel is attractive, but most guests are focused on the devices they brought along.