Unlike similar devices with only one steady output, B4K hand held portable chargers provides customers with 5 different voltage selections. Our small hand held charger will store 4-5 times the energy of a cell phone and our large hand held charger will run a laptop 3-5 hours, a notebook 4-6 hours, and also comes with a bulit in 5V USB port. We also have a small jump starter that will fit inside a standard glove compartment of a vehicle. Simply plug it into your power-outlet and start an automobile with a dead battery without getting out of your car. We also provide a power vest that a solider can wear during warfighting times providing him/her up 96 hours of additional power. All products are based with a rechargeable Lithium chemistry. Green and CleanTechnology