Features High Performance and Versatility Low/High intensity settings Frequency selector offers a complete frequency range-1 to 500 Hz Suitable for needles or magnets. Unique Wave Form Unique wave pulse minimizes excessive charge build up in the tissue and damaging the nerve. Safe, reliable, and easy to use Each of the 3 channels are independently controlled Special dial controls allow easy use yet safe operation Built in battery life check with indicator light Pulse Rate 0~500 pps., variabl