3M E-A-R Caps Model 200 Banded Hearing Protector — NRR 30 Semi-Aural Earplugs HyperMax HPPE From the listing: an aerosol

From the listing: an aerosol spray format

The SAS 6101-B are single-use foam corded ear plugs

so there are no batteries to charge or replace

Can I wear this with a hard hat or safety helmet

3M E-A-R Caps Model 200 Banded Hearing Protector — NRR 30 Semi-Aural Earplugs HyperMax HPPE From the listing: an aerosolEDITORIAL REVIEW: 4. 5 5 WC Safety Review 3M E A R Caps Model 200 Banded Hearing Protector Editorial assessment by Steven Eaton, WC Safety editor, based on published 3M specifications and category fit. We did not laboratory test this product. SHOP HEARING PROTECTION 3M E A R Caps Model 200 Banded Hearing Protector NRR 30 Semi Aural Earplugs Overview The 3M E A R Caps Model 200 banded hearing protector is a semi aural (banded) earplug built for workers