Monsto Drives "Alphie" 4GB USB Flash Drive Data storage of 4GB 2 inches in height and 1.5 inches in width. USB 1.0, 1.1, 1.2, 2.0 compliance support, plug and play Transferring rate up to 480Mbit per second PC operating systems: Windows 7, Windows Vista, Windows XP, Windows ME, Windows 98, Windows 98SE, or Windows 2000. Apple Mac operating systems: Mac OS/X 10 or later