... .Structurally designed 4.Portable, weightless DG-200 Smart portable electronic interactive white board l DG - 200 is the upgraded ... two states of the whiteboard and screen, can achieve using i-pen to write or annotate on the whiteboard, ... Solid Geometry, Optical, Electromagnetism and chemical instrument, professional symbols, electronic MHD, electron orbital and isotopic etc. More than 860 professional ...