[Improve efficiency]: Guitar electronic system helps improve auxiliary conversion efficiency,Helps you practice hand position and muscle memory to make your playing smoother. [Easy to Install]: The teaching practice aid can be installed by simply clipping this learning tool onto the guitar neck. The installation is simple and can be completed in a few minutes. [Guitar Auxiliary Tools]: Guitar auxiliary auxiliary trainer is suitable for beginners to solve common problems such as string difficulties, inaccurate sound, fatigue, etc. [Ideal Gift]: The guitar auxiliary artifact is an ideal gift for teenagers and adult guitar lovers or beginners in the early of guitar learning. Colour:A:New Black Material:Plastic + Metal Package Contents: 1 x Chord Machine Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.