Built-in Amplifier Electric Guitar Power is turned on by inserting a 9V square dry cell battery and pulling up the pig-nose volume knob. I have confirmed that sound is produced normally from the built-in speaker, the earphone jack, and the external output jack. There is no scratch noise. Distortion increases as the volume is increased. The volume can be adjusted with the blue trim on the back cover's internal circuit board. Straight neck 80% frets remaining No buzzing or dead notes. String height is just right. Beautiful condition Comes with a genuine soft case