 The Mio P550 was a member of Mio's discontinued "Digiwalker" product line, and runs on Windows Mobile 5, with Windows Media Player 10 for portables and portable Office.The P550, in common with all other "Digiwalker" PDAs, supports GPS positioning, and features a built-in SiRFstarIII GPS chipset.The Mio P550 is essentially the same as the Mio P350, only differing in the inclusion of Bluetooth and Wi-Fi in the P550, and the difference of colour (the Mio P350 is silver-grey, while the Mio P550 is black).