Code Red Adapter . They Are "vented" To Allow The Ambient Sound To Penetrate The Ear While Providing A Clear Audio Signal From The Radio. The Molded Earpieces Mimic The Shape Of Our Ears And Lock Into Place Which Lessens The Chances Of Falling Out During A Foot Pursuit Or Other Physical Activity. Available In Small Medium And Larger Either Left Or Right. Package Contents: Code Red Ez9717 Microphone Adapter The Code Red Ez9717 Microphone Adapter is a quality addition to the Code Red lineup. For more great deals on Travel Accessories by Code Red please browse our Code Red Travel Accessories page.