Bluetooth 4.1 ( Bluetooth 4.0 to Bluetooth 4.1 is based on firmware upgrade, not hardware ) and universal intercom keeps you in touch up to 2.0 km (1.2 miles). Crystal-clear HD audio with Sena's Advanced Noise Control to block ambient noise. Audio Multitasking technology allows you to have an intercom conversation while simultaneously listening to music, FM radio, or GPS. Motion sensor technology lets you pair Bluetooth devices with a shake of the 20S. Intuitive control with hands-free voice commands.