Rechargeable USB Portable Backup Battery Pack A portable power Boost wherever you go Get a power boost! BoostTurbine2000 from Etón is a durable back-up battery with a hand turbine power generator that provides power when you need it most. For everyday or emergency use, BoostTurbine2000 enables you to charge your mobile device anytime, anywhere. Fast and Efficient Fast and efficient, in one minute the hand turbine power generator can produce enough power for about 4 minutes of talk time and a few critical texts. When fully charged, BoostTurbine2000 fully charges most smartphones twice. BoostTurbine2000 is made of tough but lightweight aluminum and with its sleek and elegant design it"s compact enough to fit in your pocket. BoostTurbine2000 features a Micro-USB DC input to use with most smartphone chargers and a high output (2.1A) USB port for charging most mobile devices, including tablets. Press button to see LED indicator of battery charge level. BoostTurbine2000 is completely self-contained and it"s all you need for an on-the-go-power solution. Features Backup Battery pack with rechargeable 2000mAh lithium ion battery Hand turbine power generator Fully charges most smartphones two times when fully charged Lightweight and durable aluminum body USB output to charge smartphone or tablet LED battery charge indicator Micro-USB DC input for use with smart phone chargers (iPhone block, etc.) Features Boost Turbine 2000 Boost Turbine 4000 Boost Turbine 4200 Boost Turbine 8400 Battery Capacity 2000 mAh 4000 mAh 4200 mAh Lithium Battery Type Lithium Lithium Lithium Lithium Charges Tablets No Yes Yes Yes Emergency Crank Power Yes Yes No No Dual USB Output No No No No Size (in) 5 x 2.2 x 1 5 x 2.2 x 1 5.1 x 2.5 x 1.1 5.1 x 2.7 x 0.6 Weight 7.0 oz 9.0 oz 5.0 oz 7.5 oz