portable mini speaker with card slot Digital Stereo Mini Speaker Supporting SD/Udisk autoplay applying to,MP3/P4,laptop,etc speaker boxDigital Stereo ... Mini Speaker Support SD/MMC/CD/USB/MP3/MP4/PC3 ... ,etc,supporting SD/U disk autoplay ,50MM dual track speaker,touch-tone function select keybuilt in 750mAh rechargeable lithium cell ...