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These are brand new AC adapters. I have two types. They plug into a standard 110 AC outlet, or a 220 AC outlet, such as in Europe, and provide 9 volts at 1 amp of current. The connector is a fairly common coaxial type, about 5mm in diameter. The center conductor is positive, and the outside is negative. These will work with lots of different consumer electronic devices....stereos, tape players, guitar pedals, phones, laptops, etc. I have lots of these available...please inquire about volume discounts.