Light up your Halloween Costume and Halloween Party. It is sure to be spooky when you add these LED skulls into the mix. Wear our LED Skull Necklaces to haunted houses or for trick or treating and pirate parties, too. Each plastic LED Skull Necklace comes with 9 - 3D skulls that light up the guests or to add to your spooky decor. Click the on/off button to choose from 3 different light settings; fast flash, slow flash, and steady on. (3) AG13 batteries come included & installed but are not easily replaced. US Patent Number: 10,064,461