No external power adapter required,so you can read CD-ROM, CD-R and CD-RW media in a completely mobile environment * USB connectivity also offers easy installation to desktop and notebook computers * USB Portable CD-ROM Drive is built to travel easily and maximize desk space * Win 98SE/ME/2000/XP/Vista compatible,Size: 160 x 137 x 17.5mm,USB cable : about 60cm long,USB power cable: about 60cm long * Comes with a USB 2.0 AGPtek All-In-One Card Reader.