The guitar is the instrument interface adapter adapter and guitar and bass tone mobile software an easy to use Adapter into the headphone jack.Insert bass guitar adaptation Stresses headphones or external speakers into the headphone jack adapter colour:black material:pvc size:5-12cm Package Contents: 4x guitar audio interfaces Only the above package content, other products are not included. Note: Light shooting 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.