This set of coaxial power supplies has almost every size and type that you can not only find on laptops. I buy, sell and trade a lot of used electronics and computing equipment and this gives me the opportunity to power things that I may not have the right power cord and/or adapter for. Using a standard 5.5 x 2.1mm wired coaxial connector and a variable power supply gives me the ability to test and evaluate almost any device that uses these types of power connectors.
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