Writable Led sign board (red blinking led) hemispheric grey, diameter 95mm, height 40mm. Being able to receive a panel in PMMA 4mm (portray plexiglas) 200x300mm max. We Engrave, cut up from form that you want, for it, send us (per email) a draft, a picture or a compatible file for Corel draw (12) or Illustrator (10), we shall adapt that for the plexiglas. 2 AA 1,5v battery cell and red marking pencil provided.