Eton BoostBloc 2000mAh Portable Backup Battery Pack-Charger for Smart Phones (one full charge for most phones) and Other Devices (NBOBL2000W) Portable backup battery pack with rechargeable 2000mAh lithium ion polymer battery Fully charges most smartphones when fully charged LED battery charge indicator Shake unit to check battery level Micro-USB DC input for use with smart phone chargers (iPhone block, etc)