... EL light,EL product,EL Wrist-watch,EL sheet,EL wrist Band,EL gift,EL,EL panel WHAT IS EL?EL Operating Theory:EL is an equipment that converts electronic power to light ... back light, mark of airport for planes landing , recognized mark at night, field wire for leading.6. Advertisement Goods ... that the seller bring with them. EL light,EL product,EL Wrist-watch,EL sheet,EL wrist Band,EL gift,EL,EL panel