As featured on OpenSea:

This Emoji LED Blinkee Pin is flashing a really goofy smile. At least he is happy. Constructed of printed circuit board silkscreened with nano-led ink. No battery required. Blinkee NFTs now use ether energy to illuminate! Won’t fall off or damage your clothing. Blinkee NFT pins use bio-magnetic clasp and are tuned to the body of the wearer.