The SENA Shoei Rider Link (SRL) is a sleek and low profile communication system tailored specifically to the Shoei Neotec 2 modular helmet. The SRL is virtually undetectable from the outside of the helmet, and functions with a simple three button control, or via a SENA smartphone app. Dual Bluetooth chip allows for up to eight hours intercom connections as well as simultaneously listen to music and talking to other riders via intercom using Audio Multi-tasking Bluetooth 4.1 technology Music will automatically decrease in volume when audio comes through the intercom, and return to a normal volume when the riders stop talking over the intercom Pair the SRL with your smartphone to stream music, listen to GPS directions, and take and make phone calls Advanced noise control technology Smart volume regulates the volume of your music when the environment outside your helmet changes due to wind noise or increased speed Built in FM radio lets riders easily scan through and save up to ten radio stations Talk time ten hours Lithium polymer battery charges in 2 1/2 hours Intercom working distance up to one mile in open terrain.