Schuberth SC1 AdvancedDeveloped in collaboration with Sena, theSchuberth communication system SC1 Advanced is small, lightweight and fully integrates into the outer shell of the Schuberth C4 and Schuberth R2 helmets. All the same features of the SC1 Standard, the Advanced has longer usage time and can be used with further distances between riders. Music sharing and FM radio features are standard on the SC1 Advanced. Easy to install, theSchuberth SC1 is plug and play, just remove the cover at the back of the helmet, place the SC1 communication unit and battery in their slots, and you are ready to roll.Features: Airtime: up to 14hours Standby: 1 week Intercom conference: 4 riders Bluetooth standard: 4.1 Bike to bike intercom: less than 1,600 meters (depending on terrain) Bluetooth sources: 2 Music sharing: yes Automatic gain control: yes FM radio: yes Charging time: 3 hours Mobile app: iOS, Android USB cable: included Fits Schuberth C4 and R2 helmets Note:Intercom range may be reduced in carbon fiber shell helmets. Need help with installation? Get your Bluetooth headset installed for free at your local Cycle Gear store. Find a store near you and get back on the road faster!