... pulse, three pulses.A/V Stimulator(1) Sound (Configured with headphone)Stimulus intensity: 30~120 dBStimulus frequency: 0.1~ ... rare wave, dense wave, alternative wave (2) Pictures (Configured with Pattern reversal stimulator)a) Pattern mode: checkerboard, vertical grid, bar ... to edit, set the pattern or color pattern. (3) Flash (Configured with goggles)Stimulus frequency: 0.1 ~ 20Hz adjustable