Seiko STM-20 Pick-Up Tuner, Black

The Seiko STM20 Pickup Tuner works as a complement to any tuner that's equipped with a 1/4" input jack. Simply plug the STM20 into the Line-In socket of your regular tuner, and clip it on to your instrument, to tune directly via the vibrations in the instrument's body ? eliminating all background interference and noise. You can tune your electric guitar during a performance without even plugging it in!