The special round and flat Magnetic Coil Adapter generates a weak magnetic field which can be used to carry frequency signals generated by the Frequency Synthesizer from TB-ELECTRONICS. The properties of the magnetic field promote the stimulation where it penetrates the tissue. Since the magnetic field is modulated by the activated frequency, the stimulation is not global but selective. The Magnetic Coil Adapter handles frequencies up to 1MHz (1 Million cycles per second). The electrode may only be used on devices with PowerPort.