In this communication system, data can be transmitted even when a user touches directly the communication module. The setup utilizes what is called "small current communication system in which the human body acts as a conductor to transmit data.
2. Electric Field Communication System
In this communication system, data can be transmitted even when a user does not touch indirectly to the communication module, i.e. when the user's hand is located several centimeters away from the module or positioned behind an insulator such as a handkerchief. The setup utilizes what is called "electric field communication system" in which the human body acts as a sort of capacitor to transmit data.