We use the 3M Optime 105's at work. There are a couple of other brands that have Bluetooth that have been approved, but one has to buy them outside of the company. The 3M X-5's have a slightly higher NRR of 31 dB over the 30 dB of the 105's. Most of the ones that have bluetooth have NRR's of 26 or less, so be aware of that. The environment that you use them in, may be of the level that you need more protection. In our case, when we do engine runs, we are required to use NRR 30 or better earplugs with the 105's or our David Clark comm headsets.
The Optime 105 are rebrands of the original American made Peltor model H10A (which was originally rated 29NRR). The X series are the Chinese 3M imports. I can't bring myself to switch over to the dark side, and I have my suspicions of whether or not there's a real difference between the two; i.e. I'm wondering how much 3M has fallen to the marketing number inflation game.
Look at this Optime III for example that claims 35 SNR reduction:
or 33-34dB on 3M's website:
But what's the real NRR? So far as I'm aware, it's illegal to sell hearing protection devices in the USA without an NRR rating (though enforcement is pretty much nonexistent), and we know full well that NRR numbers are always very much lower than dB reduction numbers or EN352 ratings that don't apply here, so it's no surprise that marketing will eschew the lower NRR number that doesn't fair well in comparison to the import dB number with something else, whether that's legal, or ethical, or neither.
...
Then I got a pair of Walker's Razor Comm BT muffs and ...
EDIT: The Walkers bit the dust in less than one summer's use. No longer would recommend...
Well that's a shame, because I bought my Walkers XCEL BT muffs late last year, and they've held up so far fairly well with light use. But you're not the first to tell me that their BT models don't last. The scuttlebutt at the range I frequent is that the cheapest Walkers electronic muffs that amplify conversations (no BT) are quite reliable, but the BT models aren't at all. My problem is that I want stereo conversational sound with good NRR. Walker's Digital X-TRM is only 21 NRR, and has a rechargeable battery, while the XCEL is 26 and takes AAs. So I figured I would take a chance. They were an upgrade from my non BT Peltor Tactical 7-S that has served me well for quite some time, but even 24 NRR was just barely cutting it for me.
The 3M Pro-Comms I was shopping against were also 26 NRR (I'm not aware of an NRR higher than 26 in a BT headset), but had a rechargeable battery that I ruled out.
I will try to remember to return here and post when my Walker's finally die.