low vis electronic earpro.
Walker gameear III is very nice option for that and also has amplification so you can hear close conversations as well. They are a bit pricey as well but fit into your ear just like a hearing aid.
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All warfare is based on deception. Hence, when able to attack, we must seem unable; when using our forces, we must seem inactive; when we are near, we must make the enemy believe we are far away; when far away, we must make him believe we are near.
- Sun Tzu, the Art of War
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