 Although BrainPort technology stimulates the tongue through the electrode array, the stimulation is not at all painful; a BrainPort device emits only 11.85 μJ per pulse regulatory limit for cutaneously electrical stimulating devices: 300 mJ. In fact, users often report the sensation as being like champagne bubbles effervescing on the tongue. Participants using BrainPort devices, whether for several hours each day over the course of a few weeks or for 20 minutes a day for up to one year, report no discomfort. 