... year warranty mp4 2.mp4 with FM, Carame,usb 2.0 3.mp4 memory 1 to 16GB 4. mp4 with 9 ... .Support audio format: MP3, WMA, WAV ,ASF,MPG ect.6.Support video format:MTV,AMV7.Digital voice ... used on files that contain data in the *.mp4 format: .mp4: official extension, for audio, video and advanced ... .m4a: for audio-only files; can safely be renamed to *.mp4, though opinions differ on the wisdom of this. .m4p ...