This neck EMS heating massager isn't designed specifically for the arms. However, if used on the muscles of the upper arms (avoiding the underarms and areas near the joints), it's theoretically safe to try. However, extreme caution should be exercised, starting with the lowest intensity and for a short duration to monitor for any adverse reactions. If any discomfort (such as tingling, redness, swelling, or numbness) occurs, discontinue use immediately.