The Eton BoostTurbine 4000 is a durable back-up battery pack with a 4000mAh lithium ion battery and a hand turbine power generator (black) that provides power when you need it most. For everyday or emergency use, BoostTurbine 4000 enables you to charge your mobile device anytime, anywhere. Fast and efficient, in one minute the hand turbine power generator can produce enough power for a 30-second call or a few critical texts. When fully charged, BoostTurbine 4000 fully charges most smartphones.
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