We did some research and it turns out people don't want to carry around big bulky items with them all the time. They want the most amount of power in the slimmest of packages to fit into any bag, purse, fanny pack, pocket, glove box...etc. We have delivered that with our Super Slim 4000 mAh Power Bank. You can charge your smart phone 1.33 times. It features plenty of power, a great branding area, and great color options that fit with most corporate logos. We print and package this particular model. An instruction manual, USB charging cord, and white tuck box included. Input/Output: 5.0V/1A. Minimum order quantity is 100 pieces.