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 ... TheoryTheory is the material layer converts the electrical power into light, illustrating as the following: EL ... them. EL light,EL product,EL Wrist-watch,EL sheet,EL wrist Band,EL gift,EL,EL panel