This Sharp Zaurus SL-5500 features a Linux 2.4 (Embedix) operating system and combines state-of-the-art Sharp technology and Sharp innovation to deliver a unique and compelling PDA solution. The Sharp Zaurus SL-5500 offers everything from mobile communications to mobile multimedia; keyboard integration and dual expansion delivering one of the most versatile and flexible PDA solutions on the market today. Order yours today, and keep things organized!