Caldwell E-Max Pro BT Ear Muffs Black. 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 BT Ear Muffs: Manufacturer: Caldwell Color: Black Quantity: 1 Battery Type: Lithium Ion Package Contents: Caldwell E-Max Pro BT Ear Muffs Caldwell 1142643: E-Max Pro BT Ear Muffs Black