Do not waste your money or time with this product if my experience is typical:  this took an initial charge, I used it to re-charge my ipad (and it was incredibly slow and did not fully re-charge the ipad), then re-charged the device, got all the lights, stored it, and then went to use it in a week, and it had no charge, and wouldn't take a charge.  Completely dead.  Waste of money, avoid this product.