Your PEG is a hybrid charger, meaning it accepts a charge from a USB computer port, wall charger, and from your body's movement.
Once the PEG's internal battery is fully charged, it holds that charge for up to 100 days sitting still. If it's in your bag moving and harvesting kinetic energy, your PEG will continue to stay charged beyond 100 days.
In an emergency, you can shake the PEG to give you enough charge to make a short phone call from a dead phone.
Please note: The PEG is not compatible with laptops, netbooks, or iPads.