This is a junk item, an Electro-Harmonix MOLE. The reasons for it being junk are that it was originally a junk item, the circuit is not a MOLE, and there are occasional issues with switch contact. The effect works properly once set up. The internal parts use what was left in the junk MOLE enclosure, and it has an LPB-1 circuit. I think the enclosure itself has value, so please purchase it with the understanding that it is a junk item. As a bonus, I've included a test Electro-Harmonix "Ojisan" battery.