This electronics kit is considered our "Pro Kit". Designed for professional drivers this non-integrated electronics kit is designed for ST5 FN helmets but can be utilized in the GT model. This electronics kit includes a 4 Conductor external coil, Gentex Noise Cancelling Boom-Mic, and 3.5mm jack for earbuds. Experience clear communication and stay focused on the track with this premium setup designed for professional-grade racing.