Universal helmet clamp Wired boom microphone Glued surface mounting adapter Updated and redesigned HD Speakers VELCRO brand fastener pad for boom microphone Premium sound for your 50S with SOUND BY Harman Kardon speakers and microphone. The 50S Universal Clamp kit with SOUND BY Harman Kardon features enhanced speakers and microphone, which were developed alongside the audio experts at Harman Kardon. The 50S Universal Clamp Kit with SOUND BY Harman Kardon is compatible with all versions of the 50S, allowing existing 50S users to upgrade their audio. The redesigned microphone and expertly crafted speakers allow the 50S to capture and deliver unmatched incoming and outgoing audio. The speakers send crystal clear audio to riders’ ears while the microphone, with a newly designed sensor, provides robust performance for voice communication while riding.