This product adopts surface electromyographic feedback functional electrical stimulation technology to monitor the weak active electromyographic signal strength remaining in the patient in real time and trigger electrical stimulation according to the muscle strength represented by the electromyographic signal, thus stimulating the muscle contraction function of the patient, in order to achieve the autonomous contractile movement of the pharyngeal muscles, training and repairing the patients muscle function.This product is only for reference. Please follow the doctors advice for details.