Loud: This is the volume control. All the way to the right increases volume, all the way to the left decreases volume.
Gain: To the right increases gain, to the left decreases it.
Treble: To the right increases treble, to the left decreases it.
Bass: To the right increases bass, to the left decreases it.
2.1mm x 5.5 mm tip/negative plug
Dimensions: 4.00″ x 2.30″
9 volt Negative tip adaptor and a 5.5mm x 2.1mm jack.
8mA current draw
9 volt Battery