We have been quite impressed with this portable charger. We use a good number of electronic devices in our home, and travel a lot - so we have a number or portable chargers that are used regularly. I have learned that the lower mAh chargers are not going to last long. This one is a 10,000 mAH charger and it lasts for several hours of constant use from items that are still in use (which would typically drain a charger much faster). It's small and not bulky and we really like it a lot.