... colors, more bright 3.go with LED writing board 4.SGS report new marker pen for led ad board -- ... ZD410,ZD510,ZD520,ZD610How to use1.activate-shake with pen cap on to make the ink uniform ;2. ... then remove cap;3.press the pen tip for several times until tip filled with ink ... , the writing / drawing / message (writed with Fluorescent marker pen ) on the board will more bright & alive along with ...