HP iPAQ hx2490c Pocket PC. Display diagonal: 88.9 mm (3.5 "), Display: TFT, Pointing device: Stylus. Processor clock speed: 520 MHz, Processor family: Intel PCA, Built-in processor: Intel PXA270 Processor. Mobile operating system provided: Microsoft® Windows Mobile™ 5.0 for Pocket PC, Premium Edition. Wireless technology: 802.11b; Bluetooth. Battery type: Removable/rechargeable 1440 mAh battery