Adjustable size with applicable head circumference 54-62cm/20-24.4inch
Simplified Noise level Reduction of 27db(SNR),Noise Reduction Rating of 21 db(NRR),the protection comes from instant blocking of any noise above 90 dB.
Uses x2 AAA Batteries (not included) with waterproof battery cap.
Deep earcup design and soft ear cushions for maximum comfort