Walkers Razor Rechargeable Ear 21dB Muffs FDE. Specifications for Walkers Razor Rechargeable Ear 21dB Muffs: Manufacturer: Walkers Fabric/Material: Polymer NRR: 21 dB Quantity: 1 Size: One Size Battery Type: Lithium Ion Included Accessories: Standard Age Group: Adults Features of Walkers Razor Rechargeable Ear Muffs Low Noise/Frequency Tuned For Natural Sound Clarify 300 Mah (40 Hours Battery Life) Usb Charging Port Full Dynamic Range Hd Speakers For Clear Balanced Sound Sound Activated Compression Sound Dampening Composite Housing 3.5Mm Audio Jack Usb Charging Cable Included Rubber Spray 23 Nrr Black And Fde Models Package Contents: Walkers Razor Rechargeable Ear 21dB Muffs Standard Walkers GWP-RSEMRC-FDE: Razor Rechargeable Ear 21dB Muffs FDE