it is a pawerbank i think 70% people in our country have to use pawerbank some times
it is more usefull for a torriest, businessman and sales man bcoz some people have no time to wait for charging her phone and some have not facility to charge his phone a business man always busy in his business and torriest always go to out of town in this situation they have to carry a powerbank to charge his phone
power bank have some good featers like if u charge ur powerbank for a time then u will charge ur phone by his mah u can check ur powerbank chargeing % by pressing weels button and indicator has show ur power % it's usefull ...m...use it ..