If you have an HJC helmet this is the audio kit you were looking for! Thanks to the noise elimination system you enjoy the sound without background noise. Compatible with the HJC helmet models of the RPHA and FG series, the kit has been designed to adapt perfectly to interphones for Tour, Sport, Avant, Urban and Interphone Link bikes. Its extreme subtlety makes it adhere perfectly to the helmet, for a comfortable and relaxed journey. The audio quality of the kit is excellent, thanks to the Hi-Tech microphone and earphones.