The Korg CM-400 is a clip-on contact microphone designed to enhance tuning accuracy by transmitting vibrations directly from your instrument to compatible Korg tuners. Featuring a 5-foot cable with a 3.5mm mini plug, it's ideal for use with models like the TM-70T. The clip accommodates instruments up to 1.2 inches wide and is lined with rubber to prevent damage. Available in black and white.