Celestron PowerTank Go Waterproof Charger/Flasher

Trust PowerTank GO to keep your USB-charged devices fully charged while you're on the go. Its extra-large 7800 mAh battery can completely recharge a standard smartphone more than two times or provide a partial chage to most tablets. PowerTank GO uses a standard USB port, so you can plug in directly using your device's charging cable. At the end of your adventure, recharge your PowerTank GO with computer