... auto calibration,natural writing,muti users,infarad The i-Interactor DG-100 consists of i-cam, i-pen, USB cable, user manual, driver CD ... without break pointLow responding rate. Break point when writing.The i-pen has left click, right click and double click ... 11 mmSystem RequirementOSWindows XP/VISTA/2007CPUIntel P4-1.0GRAM128MHard Disk50M i-Interactor,i-Pen,i-Cam,iwb portable interactive white board