SENA SRL2 BLUETOOTH INTERCOM FEATURES Constructed with a dual Bluetooth chips, the SRL2 allows you to communicate with up to 7 other riders over 1.6 km (1 mile) in open terrain. Audio Multitasking™ allows you to simultaneously listen to music and talk with other riders via intercom. The intelligent design will automatically decrease the music volume when someone begins speaking, and then increase again once you have ended your conversation. The SRL2 comes with all the functions you need to have the smoothest ride including group intercom, voice commands and more. Universal Intercom™ makes the SRL2 compatible with other non-Sena Bluetooth communication systems. The SRL2 is also built with Advanced Noise Control™, so whether you're talking over the intercom or taking a phone call, the environmental wind and road noise doesn't interfere with the audio.