3M Hearing Protector with Bluetooth 4/Case *Noise Reduction Rating: 24 dB *Disposable or Reusable: Reusable *Material: Soft Foam *Product Type: Earmuffs *Number in Package: 1 pair *Color: Black *Packaging Type: Boxed *ANSI Certified: Yes *Replaceable Pads: Yes *Adjustable: Yes *Connect Wireless Hearing Protector *Bluetooth and MP3 compatible *Noise reduction rating (NRR) of 24dB or higher *Built-in rechargeable battery (charging cord included) *Integrated microphone allows for making and receiving phone calls *40mm high fidelity speakers *One button interface *No pressure headband