Recently purchased a MyCharge and love it. It does come with its own charger that you plug into an outlet. Takes about 2 hours to fully charge. I purchased it to charge my ASUS 17" laptop for use when I am in class (I don't have access to a wall outlet in class). It connects to your laptop with your laptop's charger. Basically, instead of plugging your laptop charger to a wall outlet, you plug it into your MyCharge. The charge last from 4-6 hours and you can plug in other devices at the same time you are charging your laptop using USB access.