Walker's introduces the electronic hearing muffs provides unsurpassed sound quality. Featuring single wind resistant, high frequency microphones. They offer up to 4x hearing enhancement and a noise reduction rating of 22DB. 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).Specifications and Features: Single wind resistant, high frequency, Mic 4x hearing enhancement Noise reducing rating, NRR 22dB Power source 2 alkaline "AAA" batteries included