From FastMac:
U-Socket is a duplex AC receptacle with built-in USB ports that can power any device that is capable of being charged via a 5V power adapter, but without the need for the power adapter! When a U-Socket replaces a traditional 3-prong AC wall socket, you can eliminate the clutter of AC Adapters that stick out & take up space in your home or office. Everything stays neat & organized. In addition, U-Socket’s energy efficient design only outputs power through the USB port if something is connected to it. This can save you up to $25 per year in reduced energy costs. Good for you, good for the environment and with our great prices, good for your wallet too!
