The pebbletrade explorer has a large 8400mah capacity and dual usb port designed to enable charging of 2 devices at any one time with a 21a output the pebbletrade explorer is designed to charge tablets in the most efficient way this means that your tablet power is replaced as quickly as possibly when yoursquore low on charge and away from a mains source donrsquot worry if your smartphone is also low on charge because the explorerrsquos dual port design means itrsquos capable of