An electrical machine such as an alternator has a first fan and second fan rotatably disposed within a first housing portion and a second housing portion. The device has a body which includes a hollow tube formed of a biocompatible material; at least one reservoir in the tube which contains a drug; and one or more apertures through which the drug can be released. The ceramic members are connected to the support members by elastic members so as to be movable relative to the support members. The slit is made of a single metal plate and mounted in position fixedly. The communication unit is configured for generating a communication signal.