model number is BN-SDCBAE and can be found on their web sites under SD accessories.

it should accomodate all the sizes, and is a passive device using power from the usb connection, and comes with a cd with drivers and a jukebox program.

You only need it if you want to put digital audio on the sd card. The jukebox program can rip audio cds and convert wave and mp3 etc on to the card, and keeps a backup of the audio for checking in and out to the card.

the song manager supplied with the keyboard can transfer technics, midi and pictures to the keyboard ram memory, so the card reader is not really required for that.