The Boonboom Danger is exclusive to this set and is used to control the Boonboom Killer Robo. The item can play many voice recordings, mainly the lines coming from the Seaseaters, namely: Dekotorade, Ittasha, and Yeiyei Yaruka, as well as the summoning sound of the Boonboom Killer Robo.
This Premium Bandai web exclusive item cost 13,200 yen, and is set for an October release. Pre-orders will end on July 4th.