Delkin Revel MP3 PLayer & Secure Digital SD 2 GB Memory Card Combo Removable SD Memory Card- Capacities up to 2GB Plays: Mp3, WMA, WAV, or MIDI file formats ion* Operates for 10+ hours on one single AAA battery Exchange and share music files easily Create different playlists on multiple SD cards for a large portable music collection* (*requires SD Memory Card reader)