If you have an HJC helmet, this is the audio kit you have been looking for! Thanks to the noise suppression, you can enjoy the sound without background noise. The kit is compatible with the HJC RPHA and FG series helmet models and is designed to fit perfectly with Interphones for Touring, Sport, Urban and Interphone Link bikes. Thanks to its extreme delicacy, it adheres 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 headphones. Features Audio Hi-Fi Compatibility: RPHA - FG series Easy to install noise cancelling Ultra flat design