Portable, reliable EMG unit is appropriate for the home, clinic or office. Features three sensitivity ranges and preamplification at the treatment site to ensure an extremely clean signal. Provides immediate feedback on muscle activity through a bright 13 segment light-bar and a proportional tone. Other key features include an alarm function, a lock function and the ability to set the bandpass for wide or narrow placement, above and below threshold for tonal feedback. Measures 2.4 x 4.4 x 1"