The X7 Mark II is among the first of its kinds in Chinese portable music players to adopt 2GB of RAM, allowing it to seriously multi-task and to provide a more fluid experience. The player also comes with 64GB of internal storage and 2 micro-SD card slots, each supporting up to 256GB expansion cards. This means that the X7 Mark II is able to hold up to a whopping 576GB of music, enough for over 19,000 lossless music files, 30MB in size for each. With the X7 Mark II, you truly don't have to worry about leaving any of your music collection behind, wherever you go.