Works well, can be sensitive around things like buzzy lights which are kicking off weird EM signal but that's not a real concern.

I can hear better with these than I can without my earpro on. Hands down worth every penny.

These are simply incredible. It amazes me that we have this technology available to us. Only caveat is that they seem super expensive for what they are.

I haven't studied the technology enough to fully understand it, but it works incredibly well. NFMI plugs + AMPs = near silence. Push the NFMI button and it's almost like you're not wearing any hearing pro at all. I debated on purchasing the NFMI plugs, mainly due to the superfluous price, but as an instructor I do a decent amount of indoor shooting and I can appreciate the additional level of hearing protection these plugs offer. I think the AMPs alone are more than good enough, but the NFMI plugs maximize hearing protection without sacrificing situational awareness.

These things are nothing short of incredible! When paired with the Ops-Core AMP headset, these things provide an amazing amount of protection. The earplugs come with 3 different sizes of tips and replacements are expensive but easy to order. I have mine attached to each other with a small string to keep them from getting lost when I don't have them in my ears. These things are expensive but if you have the Ops-Core Amp, you need these plugs to unlock the full potential of the noise reduction. I have a love hate relationship with the string, It can pull on your ears if it gets caught up in your sling or your ruck. Just make sure you watch the string location on your kit and you will be fine.

Wow crazy how these work , great for some one that has a hard time hearing the buzzer at the range, Love them.