Item Type: Ukulele Chord Practice Tool Material: ABS Colour: Black Product Length: Approx. 24cm / 9.4in Power Supply Mode: 1 x CR2032 button battery 180mAh 3V Package List 1 x Chord Trainer 1 x Button Battery 1 x User Manual Except for playing stored chords, will automatically shut down if there is no operation for 5 minutes. 1The Most Basic and Common Chords: This tool can display the most basic and common chords, with accurate finger positions 2Develop Chord Muscle Memory: Trainer is very suitable for beginners and students to develop chord muscle memory, which is a perfect tool for finger placement practice 3Improve Finger Sensitivity: This chord trainer has no sound when playing, because its purpose is to improve finger sensitivity without environmental restrictions 4Practice Anywhere: You can practice anywhere, such as cars, airplanes, offices, schools, dining tables, without disturbing others 5Portable Chord Trainer: You can take this portable chord trainer to anywhere, which is not as bulky as a ukulele