BOSS TU-02

SPECIFICATIONSTuning RangeA0 (27.5 Hz)--C8 (4,186.0 HzReference PitchA4 (430--450 Hz)Tuning Accuracy+/- 1 centModesCHROMATIC / GUITAR / BASS / UKULELE Flat Tuning: Regular--2 semitone lowerControlPOWER/M (mode) button A4 button Flat buttonDisplayBacklit color LCDPower SupplyACR2032 lithium battery x 1Current Draw7.5 mAExpected battery life under continuous useAlkaline: Approx. 24 hours *These figures will vary depending on the actual conditions of use.Auto off functionApprox. 5 minutesAccessoriesOwner's Manual CR2032 lithium battery