Peltor Optime II earcups with integrated NAC Intercom system, PTT on left earcup, noise canceling boom microphone with built-in sidetone, 5 mm. plug (RCA) to connect a music device like MP3 or CD player, available for VHF 2 meter (Yaesu, Icom, etc.) and all FRS radios (Motorola, Cobra, etc.).