Koopa Shellceiver

"Ready? I'm monitoring through this Koopa Shellceiver!"

- Army Hammer Bro

The Koopa Shellceiver is a device that allows the Hammer Bros. to communicate in Super Princess Peach. During the game's intro, a Goomba walks into Peach's Castle with the Vibe Scepter. The Hammer Bro then asks the player to say "all clear", which signals the attack on the castle.