About this itemUSE ONE CHARGE ONE: Plugfones revolutionary infinite battery allows you to actively listen to one set, while the other set is charging. Infinite power. Always connected, always protected. Interchangeable pairing allows for the seamless change from one pair to the other.ONLY U.S. PATENTED EARPLUG WITH AUDIO : We?ve combined comfortable, OSHA compliant NRR 22 safety-rated earplugs and our own custom tuned speakers to give you the ultimate hearing protection and rich, immersive sound.SECURE STAY IN PLACE won?t fall out all day comfort plugs. Sovereign Duo include five sizes and styles of plugs for your perfect comfort fit. PLUGFONES are designed to be worn for hours at a time, ear fatigue free. Soft foam & silicone earplugs are interchangeable replaceable plugs.EVERYDAY EARBUDS: Starting the day with a workout and then straight off to work- PLUGFONES Sovereign Duo are your go to. For the commute, meeting, study, hobbies, DIY projects, indoor or outdoor work. PLUGFONES blocks hazardous noise while playing your audio. ANSI-certified Noise Reduction Ratings (NRR) of 22 db, OSHA compliant.INCLUDES: 4 Sovereign Duo Wireless (2 pairs), Earplug Earbuds, Charging Case, Single Tier Silicone- 4 small, 4 medium, 4 large, 4 ComforTiered Silicone, Single Tier Foam- 2 Large, 2 small, Zippered Storage Case, Pocket case.WARRANTY: Money back guaranteed purchase with confidence