Low-energy, radial shockwave devices allow for what is called patient-focused treatment and do show equivalent efficacy when compared to high-energy devices. Because the patients are awake and not anesthetized (unless they are having concurrent growth factor treatment and partial fasciectomy), they can direct the physician to put the focus of the shockwave on the place that hurts them the most. This allows for biofeedback, which has shown to increase effectiveness. Patients will experience some discomfort during treatment, but it is usually tolerable. Normally, the area under treatment becomes partially anesthetized after a few hundred shocks (usually 2,000 shocks are administered at a frequency of about 15 per second). Barrett Foot and Ankle Centers were one of the first centers in the United States to have the low-energy technology available.