Schuberth SC1 Standard Developed in collaboration with Sena, the Schuberth communication system SC1 Standard is small, lightweight and fully integrates into the outer shell of the Schuberth C4 and Schuberth R2 helmets. Easy to install, the Schuberth 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 9 hours Standby: 1 week Intercom conference: 4 riders Bluetooth standard: 4.1 Bike to bike intercom: less than 1,000 meters (depending on terrain) Bluetooth sources: 2 Music sharing: no Automatic gain control: yes FM radio: no 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.