Etymotic HD•Safety™ Earplugs + Earphones - Manual (Page 3)

2
Use of these earphones at full volume on portable music players
is within OSHA Permissible Exposure Limits (PEL) for 10 ½ hours
per day (52 ½ hours per week). Because of the noise-isolating
properties of the eartips (NRR=22 dB for 3-flange eartips and
NRR=27 dB for foam eartips) ambient (industrial) noise
(up to 102 dB for 3-flange eartips or up to 108 dB for foam eartips)
has a negligible effect on overall noise dose.
The HD5 Safe Listening Earphones have been tested in accordance
with the EN50332-2:2013 sound system equipment: Headphones
and earphones associated with personal music players —
Maximum sound pressure level measurement methodology.
The acoustic output of the HD5 is more than 20 dB below the
maximum limit in EN 60950-1/A 12:2011 Information technology
equipment - Safety -- Part 1: General requirements. Because of the
noise-isolating properties of the eartips (SNR 27 to 28), ambient
environmental noise up to 108 dB has a negligible effect on overall
noise dose.
Safe Listening