Multi-functional bass effector, Navy Stomp. Preamplifier - Model Name: Navy Stomp - Brand: Piautech - Input Terminal: LINE IN - Output Terminals: D.I OUT, PHONES - Switch: ON/OFF - Knob Types: COMP, D.I., INPUT, GND, LIFT, 0dB, -10dB, TREBLE, GAIN, CLIP Has Velcro on the back. Operation confirmed. Only the main unit is for sale. Thank you for looking.