I switched one of the outlets last night to include two USB power ports.The plug unit is rather large, about the size of a ground fault outlet and so a larger box makes sense. This outlet was rather pricey ($32.00) but I know it is a charger I won't have to search around for. I installed it in the dining area for accessibility during the daytime hours.I suspect it will be convenient for visitors who need a quick re-charge for their smart phone or tablet. If the price drops, I'll consider installing one in the bedroom as well.