Aukey 12000mAh Portable Charger Power Bank External Battery Pack - Retail Packaging - Black 5V 2.1A (max) input, needs only 6-7 hours to full charge the power bank with a power adapter of 5V 2.1A or higher output (not included). Large capacity of 12,000 mAh, 5V 1A&2.1A output, simultaneous charging your iPad, iPhone, Samsung, Motorola and other device at high speed 4 blue LED indicators display the remaining power; red light flashing warns of low battery and needs recharge the power bank.