A poor-quality audio cable (3.5mm jack) can cause connection issues.
A standard MP3 player will not output enough current to be felt through skin; however, it could spike unexpectedly if connected to a cheap unregulated device. Always use a dedicated E-stim power box designed to digitally filter audio input to produce a safe, current-limited AC output. E-stim Audio Files Download
Individuals with underlying health conditions, particularly those with cardiac issues or implanted medical devices like pacemakers, should consult a healthcare professional before using such equipment. Conclusion A poor-quality audio cable (3