Battery: Powered by the two included AAA batteries this headphone gives low battery warning Four Listening Models: This Earmuff includes four listening modes Universal, Speech Clarity Mode, Hi Frequency, and Power Boost Omnidirectional Microphones: The integrated Hi-Gain omnidirectional microphones and wind noise reduction delivers crisp and clear sound Ergonomic Design: The Walkers XCEL 100 Digital Electronic Muff features an ergonomic headband design with controls for maximum comfort and convenience Bundle Includes: Walker's XCEL 100 Digital Electronic Muff with Voice Clarity, Walker's Shooting Hearing Protection Case (Black), and Walker's Crosshair Sport Shooting Glasses (Clear)