Fiber optical transmission or wireless Bluetooth transmission 24bit precision; Expandable parameters: ECG,RESP,SPO2,SEMG,EOG ... EEG/ERP/PSG System. Features & AdvantagesThis system is suitable for research area and it have been used in many labs ... flow, thoracic and abdominal respiration, Snore;7) Acoustic&Visual stimulator for ERP examination, it has three stimulation functions: sound, light and ...