TC Electronic Polytune Clip and Strukture Steel Guitar Hanger 966111001 Bundle includes TC Electronic PolyTune Clip and Strukture Steel Guitar Hanger (SGH-S1) . State of the art Clip-On Tuner Polyphonic perfection: The best polyphonic tuner to date New strobe tuner with +/- 0.02 cent accuracy Up to 18 hours of usage via a standard Lithium Coin Battery