The 3M PELTOR Probed Electronic Earplugs are designed to be used with the 3M E-A-Rfit Dual Ear Validation System and enables you to measure a Personal Attenuation Rating (PAR) for the 3M PELTOR TEP, LEP, and EEP Electronic Earplugs. The Probed Electronic Earplugs are for testing purposes only and are NOT to be used for hearing protection.The 3M PELTOR Probed Electronic Earplugs are designed to be used with the 3M E-A-Rfit Dual Ear Validation System and enables you to measure a Personal Attenuation Rating (PAR) for the 3M PELTOR TEP, LEP, and EEP Electronic Earplugs. Case includes five individual bags of 2 probed earpieces and 10 pair of Communication Eartips. The Probed Electronic Earplugs are for testing purposes only and are NOT to be used for hearing protection.