Sabrent Portable Battery Charger - 6100mAh - For iPhone, iPad - 6100 mAh - 3.10 A - 5 V DC Output - 5 V DC Input - 2 x - Black PB-BCBG-PK20

The Sabrent Power Bank High Capacity 6100mAh gives you the ability to charge your iPhone 4 three to four times, Charge your smart phones and tablets at top speed. Max Output 2.1A. Perfect for home use, road trips, long flights, picnics, camping, outdoor parties, BBQs, etc. Features Battery Capacity: 6100 mAh Input: 5.0V/1.5-2A Output: 5.0V/3.1A?Two USB output Shared) Charging time: 5.5-6 hours