The PowerVault II has 3 capacities (5k, 10k, 20k mah). It comes with 2 cables, a MicroUSB connector and a free additional connector (lightning connector). Additional USB output for fast charging (USB Type C). To check the remaining capacity, push button to show remaining capacity. Soft rubber coating nice to the touch. Li-Polymer cells to allow it to be lighter and thinner. Easy for traveling (hiking, cycling). Mobile phone 5k = 2 full charges, 10k = 4-5 times, 20k = 8 times. Most usage is phone charging for our smaller models, our larger ones are good for traveling. You can plug it in anywhere without needing to charge. For maximum life, the device trickle charges and is memory free. .