Mobile Powerbank is very usefull product that we can use in case of emergency. Where the power source for our cell phone charging is not available. Before purchasing we always have to knew what is the rating of that product response must have to be positive in the way we use.The capacity of the product is also matters, if we getting more of the power output ports then is more usefull for us.And don’t be fool by the online discounts only purchase the product that having good customer service support. I bought a powerbank recently of Callmate. That having the capacityof16800mAh with three output ports and in case of emergency there is four LED lights that having good light in the dark.It was 750 Rupees. But after a few weeks later the problem is getting started. Firstly the LED is getting down in working and after that the powerbank is getting off to charge.When I tried to contact the customer care it getting no response at all . The service center is not in our reach, it is in Delhi. So it was being so much costlier when we get a repaire for that gadget. So it is my openion that the product which having not a service support, it’s not good for customers use. I