Intercom Features Bike-to-Bike intercom communication up to 1,640 ft./ 500 m range (full duplex) in wide open terrain Rider-to-Passenger communications up to 33 ft./ 10 m range with all scala-rider® models (full compatibility) Audio Features Noise cancellation Microphone AGC technology: Automatic Volume Control according to speed VOX technology: Accept or Reject calls by voice commands Speaker Booster Functional Features Fit to full and 3/4 HelmetsQuick-release mechanism for headset Two ultra-slim speakers 4.7 mm / 0.18 in. 4 large control buttons Hands-Free Profiles Voice dial Last-number redial Call reject * Voice activated features must be supported by mobile device or mobile service provider FM Radio Features 87.5 MHz to 108 MHz receiver 6 Station memory with Search and Store functions Automatic radio muting incoming calls Radio On time: typical 8-10 hours Charger 110/240V 50/60Hz Universal Travel Charger Audio Features Noise cancellation Microphone AGC technology: Automatic Volume Control according to speed VOX technology: Accept or Reject calls by voice commands Speaker Booster