Cardo Systems Scala Rider Half Helmet Audio Kit Got a half helmet and still want communication capabilities Look no further, Scala Rider has a half helmet audio kit just for you. Designed especially for half helmets Detachable speaker set MP3 jack (cable provided) Attaches via spring clamp Optional ear curtains included Bluetooth module sold Separately Includes ultra-slim single and dual plug-in speakers Features a standard 3.5mm audio headphone jack Specially-designed padded Ear Curtains for enhanced audio experience and complete comfort Rugged and robust design Specially-calibrated noise-cancelling microphone Kit uses Pro Multiset or Q2 Pro headsets (sold separately and is required)