This is a multi-function guitar, this is an electric and acoustic double use guitar. Directly to connect amplifier without battery like normal guitar. Directly to connect amplifier with battery and use the effect inside(also can close the effect, only use the clear sound). Directly to connect headphone with battery and use the effect inside(also can close the effect, only use the clear sound). The effect inside can replace outside effect pedal, no need to take extra lines, easy to take, very good to practice yourself or perform on stage. This is a silent guitar, you can practice yourself and don’t disturb other people. This guitar have Aux in plug, you can play with backing track. The package do not including battery, as the express reject battery on airplane, so please prepare the battery yourself. Scale length: 25.5/22Frets. Body: Mahogany with Flamed Maple Top. Neck and Bridge Nut:Bone. Bridge: Fixed Rosewood Bridge. Color: trans brown, trans blue, trans Sunburst. Press this button to start/stop the drum machine. Press to enter/exit patch mode, rotate Drum/value control to DR select preset patch. Press to Store current settings to a preset patch. Press button to select drum machine parameters. Adjust the gain of the drive model. Adjust the brightness of the tone. Rotate to select modulation effects and adjust the rate/depth. Rotate to select delay or reverb effects and adjust the delay. Switch on/off speaker cabinet simulation.