3M PELTOR Optime 101 H7P3E Earmuffs NRR 24 Cap Mount Yellow 8206 It uses standard interconnect wiring oil only It uses standard interconnect wiring and serves as a drop in upgrade Combination units must be replaced as a whole at end of life rather than swapping a single sensor see 3M PELTOR Optime 101 H7A Earmuffs The 3M PELTOR Optime 101 H7P3E Earmuffs provide NRR 24 passive hearing protection with cap mount attachment for 3M hard hats — delivering Optime 101's higher attenuation passive cup performance in a cap mount configuration for workers in combined hard hat and hearing protection programs who face louder noise exposures where the Optime 95's NRR 21 is insufficient and NRR 24 provides the additional 3 dB of OSHA calculated attenuation needed for compliance in higher intensity industrial noise environments