The technology in our devices actually doesn’t utilize Frequency. Frequency is the number of occurrences of a repeating event, within a specified unit of time. Hertz is a unit of Frequency used in the International System of Units to represent one cycle per second. Hertz is often used to measure Alternating Current. In the field of Cranial Electrical Stimulation, Alternating Current is used in tACS devices (Transcranial Alternating Current Stimulation). Devices such as ours that utilize tDCS (Transcranial Direct Current Stimulation) utilize Direct Current, which is essentially the opposite of Alternating Current, in that it doesn’t oscillate (or repeat) and remains consistent.