nPower Personal Energy Generator
Earth Day is April 22, so it's a great time to take a step back and look at your personal energy consumption. Tech tools are often energy hogs, so we've compiled a list of the gadgets that do just the opposite.
Our first gadget is the nPower Personal Energy Generator (PEG), a $130 charger that uses body movement to charge devices. Place it upright in your bag, and go about your daily business. Later, plug in your smartphone or other electronic device and it will begin charging. It can also charge with a USB port. Once the internal battery is fully charged, it holds it for 100 days sitting still. If it is moving around, it can stay charged even longer. If your phone is dead, shaking the PEG for 10 minutes will generate enough energy to make a short call.