This giant USB-attached button is not only a visual reminder to save electricity, but a quick press puts your notebook into power-saving sleep mode. Hit the button when taking a break, answering a phone call or eating a snack, because your laptop will awaken quickly with the press of any key. The ecobutton software also records how much power and money the gadget has saved you, letting you know the reductions in your carbon footprint as well as your energy bill.