Given the device's original name, it seems like a pun that this device resembles a powder compact used by women to do their makeup on the fly. It has a purple casing and has a design of three white magatama in a mitsudomoe shape.
Allows for audio-visual communication between the keepers of each compact.
Spirit Detective SagaEdit
Botan uses this device to keep in touch with Yusuke during his fight against the Four Saint Beasts, but he loses it somewhere in Maze Castle. Also, she uses this device to communicate with Koenma from Ningenkai amidst the turmoil of the Makai insects infestation.
Chapter Black SagaEdit
Botan mentions that she left her Communication Mirror with the pink kimono that she wears while working as a Grim Reaper.