mTrigger Sensing Electrodes are custom-designed, self-adhesive electrodes engineered to deliver a clear, reliable signal of muscle activity during biofeedback training. Each electrode measures 1.25" round and features a soft, comfortable fabric overlay for optimal wearability. For accurate signal measurement, two electrodes are required per muscle, and each electrode can typically be used for 6-8 sessions, depending on activity levels. These electrodes are latex-free, designed for single-patient use, and we recommend using at least one pouch per new patient to ensure the best performance. There are 50 pouches total that are included. Please note: standard pin electrodes should not be used with the mTrigger Biofeedback System, as doing so may damage other accessories and negatively affect signal quality and overall system functionality.