Where are these manufactured?

I’m pretty sure these are made in the plant down the street from me. Check their website. Otto Engineering of Carpentersville Illinois.

Can volume be adjusted for each ear

Yes, but there are only TWO settings... and it’s not as good on sound canceling / reduction when firing weapons as a standard peltor or similar ear pro device.

Is it possible to replace the rechargable batteries as they age, or you have to buy another set? (and if not replaceable, approx. how many charges?)

Not replaceable. You would have to buy another set

Anyone use these for loud music, or concerts?

I’ve use these for figure eight derbies and they were great but they’re not a license Dealer and they will not honor the one-year warranty

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🔇 Silence the chaos, amplify your world.

PREMIUM HD SOUND - Accu-Technology delivers high definition audio quality, redefining earplug performance.
AMPLIFY THE SUBTLE - Hearing Enhancement Mode boosts softer sounds by 5x, so you never miss a detail.
EFFORTLESS CONTROL - One-button touchpad toggles between modes—simplicity meets sophistication.
ULTIMATE NOISE DEFENSE - Blocks impulse noise up to 40 dB for crystal-clear focus in any environment.
SMART ADAPTIVE ATTENUATION - Automatically adjusts noise reduction up to 15 dB, balancing protection and awareness.

The OTTO NoizeBarrier Micro High Definition Electronic Ear Plugs combine advanced noise protection with adaptive sound technology, offering up to 40 dB impulse noise blocking, 15 dB adaptive attenuation, and a 5x hearing enhancement mode. Designed with a sleek one-button interface and premium Accu-Technology for HD sound, these silicone-plastic ear plugs provide professional-grade hearing protection and clarity in a compact, stylish form.

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