Both adapters work and were used regularly to power and charge a pair of IBM ThinkPad laptops until those laptops were retired. Now, I have no use for these relatively special-purpose adapters (16V being an unusual voltage) and would like to see them go to someone who can use them rather than take them to e-recycling. One is 3.5A and the other is 4.5A. One has a "figure 8" two-prong (ungrounded) US power cord and the other has a "clover" three-prong grounded US power cord. Both have the standard IBM ThinkPad yellow barrel jack. If you have a working vintage IBM ThinkPad, without a power adapter, or are in need of a replacement or spare, this is for you.