Single SMH-20S Evo Bluetooth™ Communication System (20S-EVO-01) by Sena®. The next generation is here. Your favorite unit just got a facelift. New and Improved Design. The 20S EVO is the next generation of the original 20S, with an updated design and improved Intercom™ functionality and stability to keep up with your ride. The 20S EVO was designed with a fixed type, shark fin antenna as opposed to its predecessor with the flip up antenna. This sleek new antenna design improves upon Intercom™ stability and even secures the Intercom™ distance while updates to the hardware allow for an even more robust general performance updates.