SIMPLIFIED IT PRODUCTS-Picture Keeper: Picture Keeper is the simplest automatic picture backup device. Unique built-in software automatically finds and copies all of your photos. And it works with multiple computers; PC or Mac; saving all your precious photos to one secure device for safekeeping. No software required-just plug your picture keeper into your computers USB drive and click 'Start Backup'. It's so easy! It even will find you new additions and add those to its files without duplicating your other photos. Storage is based on average size of 1MB per picture. Requires a computer with a USB drive for use. Picture Keeper measures 2-1/2x1/2x1/2 inch. Imported.