Li'l Devil Horns

Appearance
The Li'l Devil Horns are a plastic headband with horns and a battery compartment on the right side side. The horns are lit up from the inside in darkness. The wearer will also have colorful glitter and decorative gems scattered across their cheeks; females have several sequins and glitter in various colors and sizes around both cheeks, while males will only have two identical pairs of silver beads on their left cheek and above their left eyebrow.

How to obtain
If this does not work, start over at step 1, or view the video demonstration below. https://www.youtube.com/watch?v=NMJiEkaXgp4
 * 1) Open the Nintendo Switch News application and select the article about Splatoween.
 * 2) * The article is titled Free Download! Celebrate Splatoween with this spooky in-game gear.
 * 3) * If the article is not visible, subscribe to Squid Research Lab Report (NA) or Squid Research Lab Bulletin (EU) and allow time for the news application to update with Splatoon-related news.
 * 4) Select the "Happy Splatoween" button located at the bottom of the article to start Splatoon 2.
 * 5) Open the box that appears in the middle of Inkopolis Square.

Trivia

 * The original Japanese name for this gear "Sea Slug headband," refers to the sea slug, a common variety of marine gastropods which bear horn-like protrusions on their bodies.
 * The Russian name for this gear seems to have been confused with the translation of the Anglerfish Mask's name, probably due to both of them being released for the same event.