The Scala rider PackTalk/SmartPack Audio Kit allows you to mount your PackTalk or SmartPack headset to another helmet. It comes with interchangeable hybrid & corded microphone. The Boom Microphone Cradle is compatible with PackTalk Bold and PackTalk Black. It comes with a cradle and required mounting gear. The Audio Kit includes replaceable speakers suitable for most helmets. Speakers not included with the Boom Microphone Cradle. The Boom Microphone Cradle does not include speakers. Use of Scala rider speakers required (not included). The Audio Kit attaches to helmets using metal clip or glue plate.