The Zire 31 is a
Zire Handheld from
palmOne. The product was first released in April 2004 as a replacement for
Zire 21. It runs
Palm OS 5.2.8 and features a color 160×160 display, a
SDIO slot and a standard 3.5mm stereo headphones jack. The improved PIM apps (Calendar, Contacts, Tasks and Memos) are supplied. The
ROM includes
RealOne Player giving the device some
digital audio player capabilities. They can be extended with 3rd party software, such as
TCPMP. The Zire 31 has a 5-way navigator pad, but still only 2 quickbuttons, as opposed to the standard 4 on the mid-range
Zires 71/
72.[2] It was replaced by the
Z22, which lacks the SD/MMC/SDIO Expansion and headphone jack.