The E-Max Pro high quality electronic hearing protection from Caldwell delivers style and comfort for all day use. With a 23dB noise reduction rating and a low profile design, you can stay comfortable while you 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. Low profile design earmuffs Stereo audio input jack Dual microphones for directional clarity Operates on on AAA batteries (Included) Digital volume controls 23 dB NRR