Around 3 month I using this power bank with my mi a1.What is pros and cons which I surfing with this power bank let discuss about that, when I first bought this it cost was 1599 rupees, color was proper white, charge was half of full charge.
Pros: There has 4 LED light which tell us about him power measurement .Next come to the point of charging their you will get 2 type of usb A type port for two device charging at once time.And the most surpricing fact is this power bank is you can charging phone and power bank at same time it will be fullycharged automatically with phone.If you have mi mobile then you can charge more than a simply smartphone , you can charge your phone around 4 device after powerbank full charged.
Cons: The major problem is their charging cable because most of new genaration mobile come with type c port but it come with normal old type pin and the second problem is his white color its become dirty after some day of buying and now its color is dimmed white and not suitable to see.
My great opinion : If you want to charge your device with well power bank you can buy that .