It has the OTG function which let you transfer data without computer. Just connect the USB port, use one button, can copy the data your DC, DV or MP3 player directly. It can play MPEG-4, DVD, VCD and digital camera photo on television and computer monitor. Features of the MPEG-4 HDD player This product is a multi-functional AV HDD player, with the features of volume delicate and easy to use. It's a good helper for your study, work, entertainment and a good companion for your life. Portable HDD function: USB 2.0 interface, windows management, be convenient for your study, work and entertainment. Playback function: Can play av programs as MPEG4, DVD, VCD, MP3, CD, etc. And JPG pictures Edit function: Can do the operations as copy, remove, rename, , and so on, for the files and folders in the HDD. Large capacity: Can adopt the HDD of 20g, 40g or 80g. For example: The 40g HDD can save 20, 000 MP3 songs or 70 mp4 movies. Search playback, repeat playback, a-b segment repeat playback, etc. 9-picture playback function for the picture, 12 kinds of pictures playback transition effect. Cvbs/avand VGA video output, can be connected to the TV or computer display. TV signal: Pal, NTSC, auto. Full function remote control, more convenient. Stereo audio output. Portable design: Volume only: 132 x 80 x 19 mm, weight: 215g.