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 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. (3) AAA batteries included! 23dB NRR High quality stereo sound Low-profile design for uninterrupted cheek weld Stereo audio input jack Digital volume controls Dual mincrophones for directional clarity Auto-shutoff (4 hours without touching controls) Compatible with Caldwell s Rechargeable Lithium-Ion Battery Pack (sold separately) Aqua