This is the earlier rare 2chip bucket brigade maxon Ad-900 analog delay pedal. It’s the best, big, warm, vintage sounding pedal I’ve ever played. Used it for years live,studio,home. This is the earlier rare two chip model that is sought out by collectors and tone enthusiasts with the two mn 3005 bucket brigade chips that allow higher headroom lush analog delay. it comes with the special 12v adapter needed to power it up. It’s definitely got some wear and tear on the outside but that does not affect the tone or playability whatsoever. Sounds amazing. The input for the adapter feels slightly loose but once it’s locked it’s locked in it’s solid and never has had any problems playing on some of the craziest stage settings.. you will be happy with this piece. I believe this is the 1018th model made witch puts it around 1999-2000 production era before they switched to 4 chips in 2003…