?WARRANTY?: Provide 12 months warranty service. ?Note?: 1) It's not a signal converter! 2) Only supports the player. 3) Not suitable for USB headphone. 4) Cannot connect to Laptop/ PC. 5) Cannot connect USB speakers to the TV. 6) Does not support iPod these decoder devices (This product uses external power supply. A USB cable is included). ?COMPATIBILITY?: U disk in NFTS format is not supported. Support FAT32 and EXFAT.Designed specifically for car audio. Reverse use not supported. ?SUPPORT MP3/MP4 MUSIC FORMAT?:This auxiliary line supports MP3/MP4 music format. M4A format is not supported. No need for car decoding. Support USB flash memory, but limited format. Not suitable for USB headsets. ?PLAY MUSIC IN CAR OR SPEAKER?: This product allows your U disk to play music in the car audio system or 3.5mm speaker.