Sold as 1 Each.Portable DVD Writer allows you to read DVD on a desktop or laptop. External. Average seek time: DVD-ROM: 190 ms, CD-ROM: 190 ms. System requirements: Operating system - Windows 7, vista, XP. Includes free CyberLink media suite 10 media writing software download.Ultra Compact design. Color: Black, Dimensions: 1/2""(H) x 5.6""(W) x 5.8""(D). Platform supported: PC, Media layer supported: Double-layer. Reads and writes dual layer discs. Weight: 8.68 oz.USB Powered with Anti-slip rubber feet. Maximum CD write speed/CD rewrite speed: 24x/24x, Maximum DVD write speed/DVD rewrite speed: 8x/8x. Operating voltage: 5 V, Operating temperature: 5 - 40 deg C. USB 2.0 interface for high-speed data transfer. Warranty: 2 years limited.DVD-RAM/+/-R/+/-RW. Drive type: 9.5 mm internal, Accessibility: Tray-loading, Buffer memory: 1MB. Compatibility: CD-R/RW, DVD+/-R, DVD+/-RW, DVD+/-R DL, DVD-RAM media, Compatible drive bay height: Slimline. Anti-slip rubber feet.