I am personally using this power bank last few months and I would not recommend you to buy this product as you eill not get any benefit that a geniune power bank gives. To start with this power bank is just opposite its name. As the name duggest billion but it does not save thousand amount of battery also.When I am outside with this power bank within few minutes the battery is empty.Sometimes it becomes too hot and it is very uncomfortable to hold it.In my personal view pls dont buy this becoz it will not fulfill your deeds.