Remember a time when you had to turn off your phone to conserve power in case of an emergency? Well you don't have to do that anymore thanks to the nPower PEG. It harnesses the power of movement (kinetic energy) and turns it into electrical energy, which is stored in the device for use when you need it. The PEG (which stands for “personal energy generator”) can charge a smartphone from empty to 70-75% and normal phones or mp3 players to 100%. It even charges your devices at the same rate as if it was plugged into a wall outlet. Unfortunately it doesn't work on iPads, laptops and netbooks but it's still very useful.