Chattanooga Primera TENS/NMES Unit with HAN Waveform allows you to apply TENS and NMES systems to provide a more well-rounded healing process. TENS systems involve non-invasive nerve stimulation through small electrical currents. These currents trigger your body to produce endorphins which help to control your pain. NMES systems are used to reduce muscle spasms, tone weak muscles, and assist in the healing process. They do this through emission of electrical pulses to stimulate repeated muscle contraction. The HAN TENS Waveform system uses Dense-and-Disperse modes of stimulation where 2 Hz is alternating with 15 or 70 Hz, each lasting three seconds. This method produces maximum opioid peptide dispersion, which are the endorphins that help to control your pain. This unit includes an extensive range of program options, with eight programs for TENS and six programs for NMES. The TENS and NMES have an amplitude range of 0-80 mA. This unit features a proven circuit with over 10 years of reliable performance. Battery symbol will flash on/off every second when battery falls below 6.9 volts. The Chattanooga Primera TENS/NMES Unit with HAN Waveform includes the Primera unit, carrying case, battery, Leadwires, Dura-Stick electrodes, back support belt, and user's manual.