The iPod nano works with iTunes on Mac OS X or Microsoft Windows (third-party software is available for platforms that Apple does not support). It connects through the same proprietary dock connector as the third-generation iPod, the fourth-generation iPod, and the iPod mini, using a USB 2.0 port on the user's computer. Although it uses the same connection as Apple's FireWire iPod Cable and can charge its battery over FireWire, the iPod nano does not support synchronizing over a FireWire connection. The iPod nano includes a stop watch and a multiple time zone clock function. There is also a combination lock feature that makes use of the click wheel to lock the iPod, and serves to secure the user's calendar and contact information. It was also the first iPod to include a new lyrics screen, modifiable using iTunes.