Microphone for Tuner TM-40PK This is a clip-type microphone that easily attaches to an instrument, sending vibrations directly to the tuner. Plug: 3.5mm monaural mini-plug Cable length: 1.5m Clip opening width: up to 30mm I haven't used it much because the clip opening width didn't fit my tuner, so it's almost new. Please check the size carefully before purchasing.