This is a BOSS GE-7 graphic equalizer. As can be seen from the label on the back of the unit, this is a rare, Made in Japan unit. Regarding manufacturing date and rarity: Serial number 01756 indicates that it was produced around April 1982, according to BOSS's manufacturing records. Since the GE-7 was first released in 1981, this is one of the earliest models. Japanese products from this era differ from current overseas-made products in their internal circuits and electronic components, and their vintage characteristics are recognized for their sound resolution and nuance. Condition of the product: Currently, there is a contact issue. The sound cuts out or the operation is unstable, so it is recommended for those who can perform maintenance or repairs themselves, or for those who are looking for valuable parts. Because it is a defective item sold as-is, it is offered at a lower price than the market value. Notes on use: This vintage Japanese BOSS pedal is an ACA adapter specification. Connecting a current mainstream PSA adapter (9V) may cause the LED to light dimly, but this is due to the original design specifications and is not a malfunction. To use it at its original performance, please prepare a battery or an ACA adapter.