The Etymotic Gun Sport Pro Elite Rechargeable Earplugs are ideal for gun sport enthusiasts who need protection from firearm blasts, and for people who need protection from loud continuous noise. GunSport Elite allows natural hearing when no background noise is present, provides sudden impact protection from muzzle blasts and other high impact sounds and gradually protects against loud noise from vehicles or machinery.Passive hearing protection is cheaper, and involves no electronic circuit or batteries. However, it is not selective in its attenuation, lowering both low and high sounds. That results in conversation and other important yet not too-loud sounds being drowned and lost.Electronic hearing protection uses a battery powered electronic circuit that samples your surrounding sound levels in real-time. Safe sound levels are passed through to your eardrums as-is, but the moment sound levels become too high - the hearing protection kicks in and attenuates the sound levels that rea...