I am writing this review after a month of usage. This PB is just awesome. I can charge my 3000 mah phone almost 3 times. The build is very good and looks like it has a cover on body which makes it easy and non slippery to hokd. IT has a small led light as well. There are 3 output charging ports. There is On off button but you don't use it sicne it automatically switches off when not in use and switches in automatically when you plug a device for charging.