Everyone wants one of these portable chargers! Anyone who uses a cell phone or mp3 player has had at least one time when they ran out of power while out and about. With these chargers, the texting or music listening does not have to be interrupted - just plug it in with the mobile device's charging cord and the 2200mAh Lithium Ion grade A battery will save the day. These chargers have both a USB Output and a micro USB input. 5 V/0.8 Amp output. Best of all, this product is Listed by UL, so you can be confident that you are delivering your marketing message on a safe product. UL Listing means that UL, an independent safety science company, has tested representative samples of the product and determined that they meet applicable safety standards. Be the hero and give these to customers as a gift and they will remember you well when they see the one-color imprint on the top (included). Additional imprint colors, multi-location imprints, and laser engraved designs are available for an added cost. Please call for more information about this exciting product.