The ultimate in hearing protection, with a comfortable behind-the-neck design that's easier to wear all day. Sound Activated Compression technology springs into action when the Muffs sense loud noise, providing 21dB noise reduction rating while amplifying human voices and regular sounds. They're fully rechargeable, and run for up to 200 hours on a single charge. 3.5mm input jack allows you to plug in an audio device and listen to music. 21dB noise reduction rating Sound Activated Compression technology Full dynamic range HD speakers for clear, balanced sound Comfortable behind-the-neck design Fully rechargeable, up to 200 hrs. on a charge 3.5mm audio jack accepts a wide range of input devices like MP3 players, phones, etc. Cooling gel earpads Digital soft-touch silent button operation Digital audio circuit USB-C charging cable included Order today!