BOSS PSA-100S AC Adapter - Model: PSA-100S - Brand: BOSS - Type: AC Adapter - Included: Original Box - Shipping Method: Takkyubin Compact The BOSS PSA-100S is a standard AC adapter for BOSS effects pedals, which are typically sold separately. While there are cheaper compatible alternatives, it's best to use the genuine adapter to avoid potential problems. This item was recently purchased on this site as "Like New." I am selling it because I accidentally bought a duplicate. It certainly shows little sign of use. I tested it by connecting it to my electric guitar and effects pedals, and it worked perfectly.