Up to 1X extra charge (Based on internal testing vs. iPhone 8. Results may vary by device and usage conditions). Pre-charged & ready to use. 3,350 mAh (12.2 wh); 6,700 mAh (24.3 wh); 10,050 mAh (36.5 wh); 20,100 mAh (Equivalent to 20,100 mAh at 3.6 volts). Up to 1x extra charges (Based on internal testing vs. iPhone 8. Results may vary by device and usage conditions). Up to 2x extra charges (Based on internal testing vs. iPhone 8. Results may vary by device and usage conditions). Up to 3x extra charges (Based on internal testing vs. iPhone 8. Results may vary by device and usage conditions). Up to 6x extra charges (Based on internal testing vs. iPhone 8. Results may vary by device and usage conditions). 1 USB port; 2USB ports. Up to 2x faster charging vs. the wall (Based on 1.0A iPhone wall charging block versus the Duracell Powerbanks 2.4A output). For apple, android & most USB-powered devices. Compliant carry-on. Recycle battery according to local, state and national regulations.