Ear Muff TAE-80 TRUSCO

By turning on the volume knob, you can hear the sound from the built-in speaker, so you can have a smooth conversation even while you are wearing it.If you hear the noise of 80dB or louder when ON, the speaker automatically turns off, so it does not interfere the function of the ear-muffs.W x H (mm):140 x 175NRR Rating: 22dBANSI (American National Standards Institute) Certified Products CommodityUsage Time(guideline): AA batteries x 2(sold separately), Manganese: 250 hours, Alkaline: 600 hoursEar Pad: ABS Resin, Polyvinyl Chloride (PVC)