I bought this powerbank from a nearby intex show room as I had heard that this power bank is of good quality and friend was using it from one year. This 11000mah power bank is really nice and has a good power backup.I had to return to my hostel from home and my father was also coming with me. It was unfortunate that there was electricity problem since two days before and we both had our mobile discharged but we had our power bank full charged. Journey was of two days by train and this power bank was enough to charge teri mobiles till two days.best product