If you've ever owned a 1st generation MacBook, you'll recognize this little friend. The premise of this 2.1mm DC Barrel Jack to 1st Generation MagSafe Adapter is simple. There's a MagSafe plug on one end and a 5.5mm/2.1mm DC barrel jack with center positive polarity on the other. This allows you to connect a 15-20VDC power supply to something that expects to connect to 1st gen. MagSafe. https://elecena.pl/product/17501766/2-1mm-dc-barrel-jack-to-1st-generation-magsafe-adapter 2021-04-07 https://elecena.pl/product/17501766/2-1mm-dc-barrel-jack-to-1st-generation-magsafe-adapter 2026-03-17