Sena 20 S EVO HD Bluetooth Headset The 20S EVO Motorcycle Bluetooth Communication System represents a level of refinement from the proven market leader, the Sena 20S. Improving on the stellar performance of the Sena 20S EVO System, the 20S EVO HD includes improved, high definition speakers. An integrated shark fin antenna strengthens the signal within the specified 1.2 mile range to enhance intercom stability. Stay in contact by calling hands-free on your Bluetooth phone, rock out to your favorite riding jams in stereo or listen to voice instructions of GPS navigators by Bluetooth wirelessly, all the while having conversations in full duplex with a passenger or other riders. The 20S EVO is a state-of-the-art motorcycle and powersports Bluetooth communication system. The unit provides a sleek and aerodynamic design that offers a versatile jog dial that maximizes the ease of use for riders. The Sena 20S EVO features several industry firsts for the motorcycle Bluetooth communication headset market. Bluetooth 4.1 technology with dual Bluetooth communication modules increases the performance and reliability of the headset while also allowing for increased high definition audio quality. The advanced Audio Multitasking allows for a seamless blend of incoming and outgoing audio to create a mixed audio experience versus the traditional interruption based audio technology of other Bluetooth devices. The audio multitasking function creates the most close-to-natural audio sound while running multiple audio functions simultaneously and intelligently. With the 20S EVO, users can call handsfree with their Bluetooth mobile phone, listen to stereo music or voice instructions of GPS navigation by Bluetooth wirelessly, and have intercom conversations in full duplex with a passenger or other riders.