Stores up to 1,000 tracks. DRM 10 compatible. Rechargeable via USB port. 2.0 USB port. Portable solid state. 2GB memory. MP3/WMA/AAC compatible. Shuffle as a play functions. Stores up to 500 tracks. 90mins charge for 12 hour playback. 3mins quick charge for 90mins playback. The new W Series Walkman gives you music you can wear. So light you will hardly notice it and stable enough not to fall off when you are exercising. The Zappin' playback function quickly finds any of your (up to) 1,000 tracks when exercising. Transferring your music to the W Series is easy with the Content Transfer software, even if you have an iTunes library. USB cable supplied. Software supplied. Docking cradle. In ear headphones supplied.