With the ultimate comfort and flexibility in mind, the Pliant Technologies PHS-IEHU-4F CrewCom In-Ear Universal-Fit Headset features a 6-Pin Female Mini (TA6F) XLR connector, Uni-directional noise-cancelling electret microphone, and can be used with CrewCom Compact Radio Packs (CRP-C12). The headset not only provides great comfort but also flexibility by utilizing silicone ear concha locks and ear buds for ether left ear or right ear orientation. In addition, the in-ear headset also supports custom ear molds specifically designed for a individual user's ear from custom ear mold manufacturers Sensaphonics and Coda Room Audio.