Walker's introduces the Electronic Hearing Muffs provide unsurpassed sound quality. Featuring single wind-resistant, high-frequency microphones. They offer up to 4x hearing enhancement and a noise reduction rating of 24db. The highly advanced technology incorporated allows excellent speech clarity, superior hearing protection, and sound enhancement. Guard your valuable hearing with an additional layer of protection given by the electronic sound-activated compression circuitry, which reduces loud sounds such as muzzle blasts to levels safe for your ears. Power source 2 alkaline AAA batteries (included).