Palm handhelds continued to advance, including the ability to access computer hard drives via USB cables, and began to merge with smartphones. The "Treo 700w" was one of the later offerings that combined a Palm handheld with mobile phone, e-mail, MMS, and instant messaging (SMS) technology. It was also the first Palm-branded device to use Microsoft software (Windows Mobile) instead of its own Palm OS. It became widely expected that Palm handhelds as a PDA-only device would disappear as multifunction handhelds like the Treo 650 declined in price. Multifunction handhelds generally include a wider range of abilities traditionally found in separate devices, for example: an MP3 player, mobile phone, camera, Wi-Fi and Bluetooth. The Treo 650+ was a series of smartphones that included a camera, mp3 player, Bluetooth, and a mobile phone. The Zire 71 and 72 series also had these additional features. In 2007, Palm released the Palm Centro, a smartphone running Palm OS. Different in overall appearance from the Treo, it was most notably thinner. The Centro was a somewhat successful smartphone, combining many features with a decreased price. Palm later released the Palm Treo 500v, a device similar to the Centro which ran Windows Mobile 6.0.