EMDR tappers (aka pulsators or buzzers) are units that use tactile bilateral stimulation to activate the two hemispheres from the brain. There are lots of popular EMDR buzzer styles on the market. Some Incorporate auditory stimulation with Visible cues, like flashing lights. Other people give customizable sound patterns and intensities. https://hasster.com/blogs/46492/Is-EMDR-Therapy-Effective-in-the-Treatment-of-PTSD-and