This power bank is great! The speed at which it charges devices is just like using a "fast charging" regular charger, so my phone only takes just over an hour to go from 15% to 100% using the power bank which I was very impressed with. The power bank takes a few hours to charge up fully but the 4 lights on the side will all stay lit up when fully charged. The charge lasts a long time so no need to recharge after each use. It doesn't heat up like other power banks I've previously used so seems a lot safer and much better quality than other ones. Overall I highly recommend.