I started using this power bank from few months and let me tell you it's design is very classy and cool and compared to its size its battery backup is alot and can give you whole day battery backup if you haven't charge your phone at all . Once I was facing a issue with its charging port and sony service center repaired it very quickly with taking my alot time no matter what sony makes they give their best and satisfy customers for sure according to its Design and battery its price is very affordable and cheap, I will going to buy another one for my sister this week .