Function: JOYO JT-15B Mini Clip-on Tuner with LCD BacklightFeature:- A mini tuner new designed for chromatic， guitar， bass， violin and ukulele.- LCD screen with backlight to display operations， and can 360 degree freely rotate for best viewing.- With a clip， the tuner must be clipped onto your instruments to tune.- Packaged with a CR2032 battery， power off automatically after 3 minutes for saving the battery if no operation.Brand: JOYOModel: JT-15BA4 Frequency: 440HzTolerance: + / - 1 centTuning Range: A0(27.50Hz) ~ a3(1760Hz)Tuning Item: c-Chromatic， g-Guitar， b-Bass， v-Violin， u-UkuleleScreen Display Modes:- Flat: If the indicator in the screen points toward left and the screen in white- Sharp: If the indicator in the screen points to be right and the screen in white- In Tune: If the indicator stays vertical and the screen in greenPower Source: 1 x CR2032 BatteryColor: BlackProduct Weight: 22gPackage Weight: 46gProduct Dimensions(L x W x H): 44 x 31 x 12mmPackage Dimensions(L x W x H): 100 x 155 x 34mmAfter Sales Service: 1 Year Warranty1 x User Manual1 x CR2032 Battery