Bass preamp with versatile tone-shaping features. Includes a 9V AC adapter as a bonus. - Model Name: BASS ATTACK VXL TONE-SHAPER PRE AMP - Brand: Hartke - Controls: BASS, TREBLE, MIX, SHAPE, LEVEL, DRY EFFECT, HARMONICS - Switch: ON/OFF - Input/Output: 2 x 1/4" (Input/Output) Thank you for looking.