This pebbel pB66 it has20000mAH li-polymer ultra slim .it has dual usb outputs , so at a time u can charge two mobiles.it helps for us when we are going for long distance travels.it takes less time to charge and produce fast charging to mobiles and it lastlongs.its design is simply nice and easy to hold because of it’s slim nature.it has massive battery capacities.it can be used for years.it is a correct and quality power bank which we can buy.