Noise cancelling boom microphone technology for voice operated transmit and push to talk 2 way radios. Provides great sound performance in any environnment. Compatible with mostfamily FRS and GMRS two way radios.Also compatabile with AudioVox, BellSouth, Kenwood and Midland models in VOX MODE only. Includes Jabra Eargels for custom fit. Provides hands free convenience for active radio users and allows 2 way talk.