The numbers are designed to create a multi-dimensional effect that makes them look like they are stacked in multiple layers. Hearts add to the overall cuteness of the design. Press a button and a black light turns on, which decorates the face and hands with a splash of attractive color. The numerals, dial, and hands of the new BGA-130/131 models are coated with a special fluorescent ink that becomes luminous under the watch is black light LED. All of this plus World Time and 100-meter water resistance make these watches a functional as they are cute.