Configured with built-in lithium battery for 3-4 hours working, Software is ... , double pulse, three pulses.A/V Stimulator(1) Sound (Configured with headphone)Stimulus intensity: 30~120 dBStimulus frequency: 0.1~20HStimulation ... method: rare wave, dense wave, alternative wave (2) Pictures (Configured with Pattern reversal stimulator)a) Pattern mode: checkerboard, vertical grid, bar ...