What is the Difference Between the Sena 50R and 50S ...
Jun 15, 2020· The "S" can be considered Standard because it uses Sena’s standard helmet clamp. Whereas, to keep the profile low and be sure that it can weather extreme conditions, the 50R can attach directly to your helmet without a clamp, but also has the option of a slide-in clamp. Unlike the 50R, however, the still-sleek 50S has a quick-release mechanism.