Avazzia BEST™ Devices are micro-current Biofeedback TENS devices. Biofeedback is the body's response to the stimulus, and the technology's ability to detect, measure, analyze and respond to the body. As the BEST™ product is applied, a "high voltage, micro-current" signal is passed through the skin. With each signal, the eletrical properties of the tissue changes. The device detects the change and responds, resulting in ...