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Electrotherapy applies electrical stimulation to nerves and muscles via adhesive pads placed on the skin. The Lectra4 Four Channel Multi-Mode Interferential Therapy And Muscle Stimulator is powered by batteries, and an adapter that allows powering from an outlet. Interferential current is essentially a deeper form of TENS. In essence, IFC modulates a high frequency (4000 Hz) carrier waveform with the same signal produced by a TENS unit. The high frequency carrier waveform penetrates the skin more deeply than a regular TENS unit, with less user discomfort for a given level of stimulation. Deep in the tissues, the carrier waveform is cancelled out, resulting in a TENS-like signal deep under the skin.This Interferential Unit and Muscle Stimulator work in different ways, depending on what type of problem they are treating. Muscle Stimulation device is excellent for pain relief management. This electrotherapy device comes with four independent channels. The muscle stimulator and interferential therapy device helps in increasing blood circulation and for treating chronic or acute pain management. The output modes of this electrotherapy device are true interferential and conventional muscle stimulation. Lectra4 Four Channel Multi-mode Interferential and Muscle Stimulator has full 1 year warranty covering parts and labor. The package includes Lectra 4 Four Channel Multi-Mode Interferential And Muscle Stimulator, Lectra UL approved AC wall adapter, 2 AA rechargeable Ni-MH batteries, Lectra UL approved battery charger, Removable Belt Clip, Compliance Monitor, Instruction Manual and Carrying Case. Less