Electronic Hearing Protection We found a real bargain on an electronic hearing protector that works as good as the expensive ones and now everyone can afford a pair. Noise reduction rating of 24 decibles, allows normal hearing up to 85 Db, reduces noise over 85 Db, on/off switch for microphone, and requires 2 AA batteries (mgr-886), which are not included. Perfect for shooting, hunting, or machine work, imported.