... -1500-101DTechnologyElectro-Magnetic SensingTouch System PenElectronic Pen (AAA NI-MH Battery)Resolution2000 lines/ inchTracking Speed315 inches/ secondSampling Rate180 ppsCoordinate Accuracy±0 ... : Pen, Brush, Flat Pen, Texture Pen, Transparent Pen, Magic Pen. Electric projector screen,interactive whiteboard,PH-1500-101S