Not really useable - ISOtunes Sport OPMOD CALIBER True Wireless Tactical Earbuds With Bluetooth, 25 NRR

I received these with another purchase (no charge). They fit fine and they connect to bluetooth, but there is a constant noise (sounds like wind noise) that might be due to a noise cancellation feature. The only way to stop the noise is to turn the devices off, so I really don't see any use for them. They do fit under my earmuffs, but so do regular foam earplugs that weigh less.

These are not useful with the constant wind noise while they are on.