State of the art Clip-On Tuner. Polyphonic perfection: The best polyphonic tuner to date. New strobe tuner with +/- 0.02 cent accuracy. Ultra-bright and easy to read display. Adaptive screen: ensures a perfect readout no matter where you place PolyTune Clip. Elegant yet durable design. High quality stainless steel clip. Flat Tunings and Capo Mode. Chromatic Only Mode Up to 18 hours of usage via a standard Lithium Coin Battery (CR2032)