Features: 1.Operating System: Support for Windows 98SE/ME/2000/XP/WIN7/VISTA operating system, support for OS8.6 or higher. 2.High Performance: Power saving design, extra strong error correction, shockproof, low noise. 3.Applicability: The DVD player is suitable for notebook computers, mobile PCs and compatible PCs. 4.Power Supply Mode: USB bus power supply, using chip, no need for external power supply! 5.DOS Booting: Using a chip, it can be used to boot the installation system and support USB booting before booting. specification:Item Type: External DVD Player Material: Aluminum Alloy Applicable Types: Notebook, Desktop, Netbook, All in One Installation Method: External, Usb Interface, Plug And Play Optical Drive Type: COMBO DVD ROM Interface Type: USB2.0 DVD: 8X Reading Speed, CD Reading Speed 24X Burning CD Speed: 24X DVD Does Not Support Burning Cache: 2M Interface: USB 2.0, Backward Compatible With USB 1.0/1.1 PackageList: 1 x DVDPlayer 1 x Data Cable 1 x Power Supply Line 1 x User Manual NoteOne of the tetragonum port is a USB data cable, which must be connected. The round port is a USB cable, which is used when the power supply is insufficient, and it does not matter if it is usually connected.