Just Pin It. For Honda, BMW, J&M, and Harley Davidson. Audio and mic capabilities. Interfaces earplug speakers with a standard 3.5mm (1/8") stereo plug to intercom/bike systems. Using this adapter temporary shuts off the in helmet speakers and sends the sound to the earplug speakers and allows you to use your microphone. It provides clearer sound as earphones are louder than helmet speakers. Proudly made in the USA.