I use this for my cell phone (iPhone) and my laptop (Dell). I use the usb port to charge my laptop and my cell phone, I have been impressed with how long this power bank stores the power for and how long it will last when powering other devices. I have many different forms of portable chargers and so far this one is my favorite. I appreciate that it is small enough to put this in my purse, drawer in my desk, glove box, etc. I could've avoided buying many other power banks if I would have purchased this one first.