Smart Automatic Guitar Tuner, Full-Color LCD Screen - Metronome & String Winder for Electric Guitars, Acoustic Guitars

Product size: 56mmx34mmx113mm Weight: 173g Motor power: 21W Battery capacity: 3.6V 3100mAh Maximum charging power: 5V 2.1AYou may also like Piano Tuning Kit,Professional Tuner Tools Set Universal DIY Repairing Accessories.