In addition, turning the crystal circle will activate additional sounds and LEDs, which will reproduce a flame-like effect for Mebius' other forms and finishers. The BGMs included are: "Mebius!", "Mebius! (Another Mix)", "Mebius Burning Brave!", and "Bond of Friendship".
Finally, you can combine both transformation braces to form the Knight Mebius Brace. This Premium Bandai web exclusive set cost 13,824 yen and is set for a March 2019 release.
[Source: Hero Club]