The Etymotic Gun Sport Pro Ear Plugs. 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 reach your eardrums.That means you can keep your hearing protection in at all times in the shooting range. When talking to your instructor - you'll hear them clearly and naturally when no loud background noise is present. When you or someone nearby shoots, or continuous noise from vehicles or machinery becomes present - you are protected automatically!GSP electronic earplugs use Etym...