Chattanooga Primera TENS/NMES Unit with HAN WaveformBrand: Chattanooga Color: White Gray Features: Extensive range of program options with 8 programs for TENS and 6 programs for NMES; TENS and NMES amplitude range of 0 80 mA HAN TENS Waveform uses Dense and Disperse modes of stimulation where 2 Hz is alternating with 15 or 70 Hz, each lasting three seconds for maximum opioid peptide dispersion TENS system involves non invasive nerve stimulation through small electrical currents which trigger your body