Walkers Alpha Muffs SSL (Super Slim Lite) with carbon graphite finish; 2 wind resistant, high frequency, stereo microphones for precise sound directionality; 5x Hearing Enhancement; Power 50dB; 2 independent volume controls; Sound activated compression (SAC); Anti-Microbial Ear Pads; Noise reducing rating, NRR 24dB; Power by (2) Alkaline AAA batteries (included).