This is a Maxon FL301 Flanger. I confirmed that it powers on, but no sound came out from the guitar amplifier. I am a novice, so I don't know if the problem is with the circuit board or something else. Therefore, I am selling the unit only as a junk item. There is no box. Brand: Maxon Model: FL301 Power: DC IN 9V/10V #B'z #Takahiro Matsumoto #Maxon #Flanger