This guitar exerciser is a perfect tool for finger placement exercises. Features: Built-in rotatable screen with built-in chords that helps guitar beginners/students develop muscle memory for chords. Equipped with real guitar piano strings to help guitarists create old cymbals. The tension of the strings can be adjusted by the tools in the package to suit themselves and optimize the user experience. There is a metronome inside the device, so players can learn chords at a custom speed. Compared to large guitars, this exerciser is very compact and can be carried anywhere, anytime. Silent design, no noise and interference, convenient and practical. Specifications: Material: ABS, wood, electronic components Battery-model: CR2032 (not included) Package size: 300 * 60 * 45mm / 11.81 * 2.36 * 1.77in Package weight: 240g / 8.46ounces Note: 1.Due to the different display screen and light effect, the actual color of the item might be slightly different from the color showed on the pictures. 2.The b-attery is not included in the product. It need our customers to purchase by themselves. Thanks for understanding. Package List: 1 * Chord Exerciser 1 * Hexagonal Wrench 1 * Cloth Bag 1 * User Manual