Boost Case Powerhouse Duo 6600mAh Extended Battery Pack for iPad, iPhone 4, iPod, HTC, Blackberry, Droid (Red) Dual output 2.1A & 1A - simultaneous charging & extending battery for any tablet, smartphone 6600mAh Li-Poly Rechargeable - 5X Battery Life on the go for iPhone, HTC, Samsung, & any other smartphone Double Battery life for iPad 2, iPad, Samsung Galaxy Tab, Kindle, & any other tablet 2.1A output for quick charging up to 4X faster for iPhone 4, iPod Touch, HTC Evo, Samsung Galaxy, Droid, etc. Battery level LED indication, ON/OFF