Noise Reduction Rating of 21 decibels for superior auditory protection; Acoustically modeled on gunshot reports to achieve the optimal balance of all-day comfort and noise reduction; 3x amplification, two full dynamic range HD speakers and 2 omnidirectional microphones; Safe level sound compression technology with a refresh time of less than 1ms; Soft cushion ear cups for all-day comfort; Side cut for fitting around a gunstock; Adjustable volume; Electronic hearing protection; AAA batteries included; 200+ hour run time