Walkers Alpha Muffs 360 in NXT Camo finish with 4 wind resistant high frequency stereo microphones for precise sound directionality; 9x Hearing Enhancement; Power - 50dB; 2 independent volume controls; Sound activated compression (SAC); Anti-Microbial Ear Pads; Noise reducing rating NRR 24dB; Powered by 2 Alkaline AAA batteries included.