Conventional low frequency neurostimulation is applied with a tonic wave shape (pulse width is usually 300 to 500 μsec, amplitude 2 to 5 mA, and frequency 40 to 50 Hz); this kind of stimulation produces a perceptible paraesthesias in the area of stimulation "covering" the region of pain. Further development in waves of stimulation during the recent years led to new paradigms of sub-perception stimulation like "Burst" stimulation that has characteristics of a cluster of waves with higher frequency.