HiDow has the latest state of the art TENS machines. Older style TENS machines usually have a singular pulse. After a period of time, the brain registers the same stimulus, therefore, becoming less and less effective. What makes HiDow devices different to many other TENS machines is that they feature between 6 and 18 different pulses. The HiDow unique random feature cycles through the modes ensuring the brain does not become familiar with the stimulus, making the HiDow far more effective than other TENS devices on the market