Illuminated bottle cap with epoxy dome

An illuminated magnetic-clasp bottle cap comprising a bottle cap with a printed circuit board mounted thereon, the printed circuit board having an IC flasher circuit including a plurality of COB LEDs mounted thereon, the bottle cap further comprising a low-profile epoxy dome covering the LEDs, a battery holder extending below the printed circuit board and the central portion of the bottle cap and containing at least one battery operatively connected to the IC flasher circuit, and a magnetic clasp for holding the bottle cap on an object with first and second mutually attractive parts of the magnetic clasp located respectively on first and second surfaces of the object.