Miniature Communicator

This gadget is a minute piece of Serpo engineering that picks up the brainwaves of whoever wears it, opening a telepathic link between everyone on its network. It also projects a heads-up display and offers several functions. Turbo Granny, struck by its look, likened it to a piece of nori seaweed.

The communicator is a small black-cased chip showing a printed circuit board. Stuck onto the skin, it ties itself to the wearer's brainwaves no matter their species or yokai nature, letting connected users speak mind to mind so that loud noises like explosions never drown out the exchange. Tapping it once raises a map of the surrounding terrain along with camera positions, coordinates, and the locations of friends and enemies. A second tap cycles between camera views, and a third switches the display off.

Rokuro most likely handed the group these chips, and before heading off to fight the invaders, Aira pressed one onto Okarun's face in case he woke. Riding the mobile Ayase Residence toward the city, Momo had Jiji put one on for battlefield coordination and explained its features and the need to gang up three-on-one against each alien. When Momo touched Bamora's aura and glimpsed her memories, the link let Aira, Jiji, Mantisian, Rokuro, and even Okarun share the vision. That shared intel let Jiji sharpen his Evil Gun and Aira invent the Pirouette Noble Drill. Afterward Turbo Granny, mistaking a stray chip for seaweed, stuck it to her forehead and tapped into the Serpo's UFO data, learning of Saint-Germain's collaboration with the aliens. In the Danmara arc, the device let Turbo Granny coordinate with Rin from outside the cursed trunk while she and Okarun worked inside the diorama. Its users include Rokuro, Momo, Aira, Jiji, Mantisian, Okarun, and Turbo Granny.