External DVD Cd Player and Burner Usb 3.0 Ultra Slim Portab

External dvd cd player and burner usb 3.0 ultra slim portable dvd cd playerinstruction: 1.do not use usb hub,or extension lines,it is possible not to recognize the driver or not to read the cd/dvd. 2.when using dvd,please make sure the dvd region code is what and the dvd region code that the dvd player can decode. 3.the product must be properly connected to the computer's usb port via a standard usb data cable 4.the data cable in pure copper braid process,anti-interference ability,signal attenuation,more stable transmission.