The SIRIUS SL2PK1 Stiletto 2 Portable Satellite Radio combines SIRIUS radio with your own personal MP3 music library for the ultimate portable audio entertainment experience - wherever you go. With the SIRIUS SL2PK1 Stiletto 2 Portable Satellite Radio you can enjoy live SIRIUS radio from our satellites or via WiFi, listen to stored SIRIUS programming or to your favorite songs from your personal music collection. The SIRIUS SL2PK1 Stiletto 2 Portable Satellite Radio lets you add microSD™ memory for even more personal media storage - or optional accessories for customized performance in your vehicle, home or office.