Feature:1. The Most Basic and Common Chords: This tool can display the most basic and common chords, with accurate finger positions2. Develop Chord Muscle Memory: Trainer is very suitable for beginners and students to develop chord muscle memory, which is a perfect tool for finger placement practice3. Improve Finger Sensitivity: This chord trainer has no sound when playing, because its purpose is to improve finger sensitivity without environmental restrictions4. Practice Anywhere: You can practice anywhere, such as cars, airplanes, offices, schools, dining tables, without disturbing others5. Portable Chord Trainer: You can take this portable chord trainer to anywhere, which is not as bulky as a ukuleleSpecification:Item Type: Ukulele Chord Practice ToolMaterial: ABSColour: BlackProduct Length: Approx. 24cm / 9.4inPower Supply Mode: 1 x CR2032 button battery 180mAh 3V.Package List:1 x Chord Trainer1 x Button Battery1 x User ManualNote:Except for playing stored chords, will automatically shut down if there is no operation for 5 minutes.