Caldwell E-Max Electronic Hearing Muff 23 dB Flat Dark Earth/Black Ear Cup with Black Headband The E-Max Pro high quality electronic hearing protection from Caldwell delivers style and comfort for all day use, plus it comes in youth and adult sizes and an array of colors. With a 23dB noise reduction rating and a low profile design, you can stay comfortable and protect your hearing on the range. High quality stereo sound keeps what you want to hear crystal clear and easy to use push button volume controls allow easy adjustments. Runs on AAA batteries