The Mushroom GreenZero Wall Travel Charger by Bracketron features their exclusive GreenZero Technology -- the most eco-friendly way to charge mobile devices while totally eliminating the wasteful stand-by consumption (Zero idle power) that other chargers consume when left plugged in. Take one with you for travel or keep one plugged in at home; just push the green button (top of the mushroom) to initiate the charge. This unit charges any USB powered device.