Data Pheromone System

The Data Pheromone System (情報送信用薬品 (データフェロモン) ) is a technological advancement that is designed to use pheromones to send signals.

Principles
It is a system designed to send chemical signals to a receiver without the need of electrical circuits. This achieved via the use of pheromones, similar with ants using pheromones when finding food, to let their companions know of its location. It is unknown how the receiver of the transmission receives the pheremone signal, though it can be assumed that it retains not having any eletrical circuitry as well.

The system was designed as an alternative to electrical transmission in Academy City. The system is apparently weak to heat, like that from a blowdryer.

Baggage City Arc
Though not confirmed to have been used during the arc, Kumokawa Maria suspects that the system has been implanted on her clothes, that would allow Kihara Kagun, the person she is looking for in Baggage City, is using it in order to stop her from finding him.

Maria is forced to strip and hot blow dry her maid clothes, to destroy the system that she "suspects" that was bugged on her clothes, much to Oumi Shuri consternation.