Universal Overall Guitar Acoustic Clip for Piezoelectric Pickup Microphone BlackBuilt-in vibration sensor. The clip is a built-in vibration sensor that can respond to vibrations and then convert them into electrical signals and deliver them through the cable to the tuner. Standard socket dimension. Jack: 6mm(appo)Cable Length: 82cmColor: BlackIt is specially designed for guitar tuning. Using it is easy, just clip it to a position where the vibrations are more obvious on the instruments. Material: Plastic Package Included: 1x Universal General Guitar Clip-line Pickup (Guitar Tuner Not Included)Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.