Boss TU-02 Clip-On Tuner

Tuning Range: A0 (27.5 Hz) –C8 (4,186.0 Hz Reference PitchA4 (430–450 Hz) Tuning Accuracy+/- 1 cent Modes CHROMATIC / GUITAR / BASS / UKULELE
Flat Tuning: Regular–2 semitone lower Control POWER/M (mode) button
A4 button
Flat button Display Backlit color LCD Power SupplyACR2032 lithium battery x 1Current Draw7.5 mA Expected battery life under continuous use Alkaline: Approx. 24 hours
*These figures will vary depending on the actual conditions of use. Auto off function 5 minutes,
CR2032 lithium battery