Korg AW3T Dolcetto Clip-On Tuner/Metronome for Trumpet This Item Includes: Korg Dolcetto-T Clip-On Tuner and Metronome - 1 x CR2032 3V Lithium Battery (for Verifying Operation) - Carrying Pouch - Korg 3 Year Parts and Labor Limited Warranty Compatibility: Trumpet and Trombone Tuner: Scale: 12-note equal temperament Tuner: Range (sine wave): Chromatic: A0 (27.50 Hz) - C8 (4,186 Hz) Tuner: Precision: +/-1 cent