Sony PRS-505 Portable Digital e-Reader System (Silver) displays eBooks purchased from the CONNECT eBook online store displays Adobe PDFs, plus TXT, RTF, BMP, JPEG, GIF, PNG and Microsoft Word files plays MP3 and AAC files (protected files not supported) internal 192MB memory memory slot holds an SD Memory Card (up to 2GB capacity) and Memory Stick Duo media (up to 8GB capacity)