I received this as a prize in a bingo game six years ago, but it has been stored unused. (The battery's insulating strip is still attached.) It's a cute, 4cm cube-shaped desk clock. The colorless, transparent glass body has a silver-colored clock embedded in it. *Some parts may appear black depending on the lighting, but it is a transparent glass product. Optical glass: Glass with a clear transparency, used in the lenses of optical cameras.