Compared with other methods of transcutaneous electrical nerve stimulation (TENS), interferential current is a form of electrical therapy that delivers currents to deep tissues through the use of kilohertz-carrier-frequency pulsed or sinusoidal currents to overcome the impedance offered by the skin. Because very-high-frequency currents are not uncomfortable for subjects, 2 currents can be delivered out of phase; these currents interfere with each other within tissues at the point at which the currents cross. The resultant amplitude-modulated interference wave has beat frequencies of between 1 and 250 Hz, which have been reported to induce analgesia in humans. This method has alternating and consecutive modes with a customizable frequency option. This form of treatment can scan, static and target sweep.