The Pro Tac Plus Gold muff is the premium contoured model of Pro Ears. Designed with a Noise Reduction Rating (NRR) of 26, the Pro Tac Plus Golds provide exceptional protection for the loudest environments while still amplifying quieter sounds (up to 8 times) for improved situational awareness. Constructed using dual circuit board technology, adjust your hearing and amplification levels separately for each ear to compensate for uneven hearing loss using the dual knob system. Additional adjustment for high and low gain using internal pin settings. Using the contoured model, experience lighter weight and greater comfort. For the ultimate in Performance, Comfort and Reliability.