Imprint Method: Laser - Never be left without a charge again with our slim metal 4000 mAh power bank. This practical item is perfect for those on the go in need of a little extra juice for their phones, mp3 players and other electronic devices. Customize our product to your liking by having your company name and logo, cause, event title and more engraved for an enhanced brand presence. What a great corporate handout for upcoming conventions and tradeshows. Order yours today!