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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🔇 Elevate your focus, amplify your world — silence and sound, perfected.

EFFORTLESS CONTROL - One-button touchpad toggles between modes with sleek simplicity.
CRYSTAL CLEAR AUDIO - Accu-Technology delivers high-definition sound quality for premium listening.
ULTIMATE NOISE DEFENSE - Blocks up to 40 dB of sudden loud noises for uninterrupted focus.
HEARING ENHANCEMENT MODE - Amplifies soft sounds up to 5 times, so you never miss a detail.
SMART ADAPTIVE ATTENUATION - Automatically adjusts noise reduction up to 15 dB to suit your environment.

The OTTO Engineering NoizeBarrier Micro Earplug (V4-11029) offers professional-grade hearing protection with up to 40 dB impulse noise reduction and adaptive noise attenuation up to 15 dB. Featuring a hearing enhancement mode that amplifies soft sounds by 5X and a user-friendly one-button touchpad, it combines cutting-edge Accu-Technology for high-definition sound in a compact, unisex design.

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