Caldwell E-Max Pro Hearing Protection Aqua. 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. Specifications for Caldwell E-Max Pro Hearing Protection: Manufacturer: Caldwell NRR: 24 dB Battery Type: AAA Battery Quantity: 1 Condition: New Features of Caldwell E-Max Pro Hearing Protection 23db Noise Reduction Rating Low-profile design for uninterrupted cheek weld High Quality Stereo Sound Easy to Use Push Button Volume Controls Illuminated On/Off Indicator Auto-Shutoff (4 Hours without Touching Controls) Runs on Caldwell's Rechargeable Lithium-Ion Battery Pack (Included) or 3 AAA Batteries Compact folding design Package Contents: Caldwell E-Max Pro Hearing Protection Caldwell 1101672: E-Max Pro Hearing Protection Aqua