Protect Your Hearing - Walker'S Razor Ear Muffs Have An Ultra Low-Profile Design Featuring Extra Slim Ear Cups, For A Secure Fit; These Ear Muffs Protect Against Hazardous Noises, While Still Letting You Clearly Hear Everything Going On Around You | Sound Amplification - Walker'S Razor Ear Muffs Amplify Safe Sounds Using Two Hi-Gain Microphones To Provide Clear Omni-Directional Hearing; The Low End Frequencies Are Enhanced To Produce Accurate, Natural Sound | Rugged Design - These Muffs Feature A Rugged Design With A Rubberized Coating, Helping To Prevent Damage To The Interior Electronics; The Housing Is Made From A Sound Dampening Composite; The Headband Is A Padded Metal Wire Frame | Easy-To-Use Controls - These Muffs Have A Volume Control Knob On The Outside That Is Slightly Recessed - A Perfect Balance Between Providing Easy-To-Use Controls, And Preventing Accidental Volume Adjustments; The Battery Door Also Opens From The Exterior | Listen To Music - These Ear Muffs Also Have An Audio Input Jack, Allowing You To Plug In Your Phone Or Other Favorite Sound Source, Effectively Converting These Ear Muffs Into A Set Of Headphones With Hearing Protection