WORLD-CLASS AUDIO QUALITY FOR YOUR SENA 50S: Premium sound for your 50S with SOUND BY Harman Kardon speakers and microphone. The universal 50S helmet clamp set with SOUND BY Harman Kardon features improved speakers and a microphone that were developed together with the audio experts at Harman Kardon. The universal 50S helmet clamp set with SOUND BY Harman Kardon is compatible with all versions of the 50S and allows 50S users to improve their sound. The redesigned microphone and expertly engineered speakers enable the 50S to capture and deliver unmatched incoming and outgoing audio. The speakers send crystal-clear audio signals to the driver's ears, while the microphone with a newly developed sensor offers robust performance for voice communication while driving.