Carlson Explorer is a handheld computer with a customized keyboard that optimizes the performance of Carlson SurvCE data collection software. Carlson Explorer Specifications Power: Rechargeable Nickel Metal Hydride battery or 6 AA alkaline batteries Display: Supertwist Nematic Liquid Crystal TFT with white LED backlight Resolution: 320 x 240 pixels QVGA color Touch Screen Environmental: Operating temperature: -20°C to +50°C Storage temperature: -20°C to +70°C Charging Temperature: -20°C to +40°C Humidity: 5-95% Non-condensing CPU: Type: Intel PXA255 processor with Xscale technology Speed: 400 MHz Operating System: Windows CE.NET 4.2 professional Memory and Mass Storage: SDRAM: 64MB Internal Compact Flash: 128MB Compact flash card slot Interface: RS232 serial communications User Input: Touch screen Full function alpha numeric elastomeric keyboard Indicators: Charge/Low Battery Indicator Physical Dimensions: Height (H): 9.84 inches (250mm) Width (W): 4.75 inches (120.7mm) Depth (D): 1.83 inches (46.5mm) Weight with NiMH Batteries: 29 ounces (822 grams) Warranty: Two years