ammoon G-10 Electric Guitar Amplifier Overdrive Professional Amp 5" Speaker with 2-Band EQ Drive select switch to switch the overdrive on/off. The clean channel is selected when this switch is out. 2-Band EQ, 1 Channel and 1/4 inch headphone jack. Treble to control the high register. Bass to control the low register. Treble to control the high register.Volume to control the output level.