EnerPlex Jumpr Quad Power Bank for Smartphones, MP3 Players and More Includes 4 AA Rechargeable Batteries (JR9200QST) Compact AA/AAA battery charger Becomes a 1,000-2,300 mAh portable battery when coupled with rechargeable batteries Charges smartphones, tablets, MP3's and GPS Rubberized finish for durability Includes 4 rechargeable AA batteries