T-29C Chromatic Tuner is the first auto clip-on tuner of its kind in the world While the tuner is clipped onto the headstock, it turns on automatically, and turns off automatically while it is removed away from the headstock. If the tuner is kept on the guitar headstock, it will power off automatically in 5 minutes no matter it is in use or not. T-29C Tuner has built-in piezo sensor. You can get better and fast tuning with it. It is an easy-to-use tuning device. And its portable design allows you to carry it with you everywhere.