Safariland Pro IMPULSE Plus Hearing Protection delivers an impressive Noise Reduction Rating of 41.7 while allowing natural ambient audio to flow through so you hear what you want to hear. Patented integrated filters automatically activate to block damaging sounds like single shots, explosions, artillery, and more. Includes keychain aluminum transport/storage case, neck lanyard, and 2 pairs of eartips. Noise Reduction Rating of 41.7 Automatically engages to protect hearing Still allows you to hear ambient audio Includes keychain aluminum storage case Batteries not required Includes neck lanyard and 2 pairs of eartips