EMDR tappers (aka pulsators or buzzers) are equipment that use tactile bilateral stimulation to activate both hemispheres from the brain. There are plenty of common EMDR buzzer models that you can buy. Some Mix auditory stimulation with Visible cues, like flashing lights. Other people present customizable sound designs and intensities. https://indibloghub.com/post/how-to-choose-the-right-emdr-tappers-for-effective-trauma-therapy