Features ● Turning on the volume knob allows you to hear sound from the built-in speaker, enabling smooth conversation even while wearing the earmuffs. ● When noise exceeding 80dB is detected in the ON state, the speaker automatically turns OFF, preserving the earmuff's noise reduction function. ● These earmuffs have a built-in speaker and an NRR (Noise Reduction Rating) of 22dB. Specifications ● Width (mm): 95 ● Height (mm): 175 ● Weight (g): 282 ● NRR: 22dB ● ANSI (American National Standards Institute) certified product ● Usage time (approximate): 2 x AA batteries (sold separately) Manganese: 250 hours Alkaline: 600 hours Materials/Finish ● Earcups: ABS resin + Polyvinyl chloride Condition New, unused. Important: Please refrain from purchasing if you are seeking perfection. Other Notes Shipping will occur on weekends. Shipping may take 3-7 days. Items will be shipped in simple packaging.