Original electrodes for Bluetens Duo Sport, the first smartphone-connected and medically certified electrotherapy device for better well-being. 4 medium electrodes and 8 small electrodes. The stimulation power decreases after a certain frequency of use of the self-adhesive pads, and the electrical impulse can become very uncomfortable with worn or damaged electrodes. Therefore, electrode pads for the EMS device should generally be replaced after 25 to 30 uses to ensure that contact and optimal stimulation performance are maintained. Additionally, pads should be replaced if they no longer adhere properly to the skin or if the adhesive side is covered with lint.