MyOnyx 4-channel encoder is a portable, rechargeable device for sEMG biofeedback and electrostimulation. It could be used with mobile APP and computer software which could be extended to the following functions: (1) Electrostimulation, (2) Biofeedback & (3) EMG-triggered stimulation. MyOnyx could provide on-the-fly instruction with immediate real-time feedback, which could help the patients to gain muscle awareness. As treatement progresses, it is able to reach deeper levels of muscle control. Also, it could receive objective and measureable training data for analysis.