Model:EAR 320-1000
3M EAR 320-1000耳機型耳塞
型號:320-1000
NRR:按照美國標(biāo)準(zhǔn)ANSI S3.19-1974標(biāo)準(zhǔn)檢測的單值降噪值。
SNR:按照國際標(biāo)準(zhǔn)ISO 4969-2檢測的單值降噪值
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