22 parallel channels for fast acquisition. Highly accurate - gives location to 10 meters. Stylus and touch screen combined with Windows CE operating system for ease of use. Bright 3.5-inch TFT screen for superior readability. Light weight at less than 170 g. Data can be loaded using an SD card and the VN 900 can even playback media including MP3 audio and JPEG,BMP,GIF,PNG image files. System:Processor: Centrality Atlas Processor at 324 MHz. Operating System: Microsoft Windows CE 5.0 Version. Memory: 192 MB NAND flash memory and 64MB SDRAM memory for operating system and embedded applications.