Inside MP3 player, support SD card,U Disk and MP3.WAV files. Controled ... which can control playing the music Electronic plush dog video player (with remote control version)1,1.5V * 4 AA batteries ... 6V2, built-in 3W dual-channel amplifier3, built-in MP3 player function, support SD card, U disk and other storage devices ... 1-6-8 three-digit number electronic plush dog video player