What does it mean when my acer chromebook 11 charger says "5v ⎓ 3a / 9v ⎓ 3a / 15v ⎓ 3a / 20v ⎓ 2.25a" on the ac adapter? I want it to output 5 volts with 3 amps, but I am confused at why it also has the other options afterward. I am thinking about using this for my Raspberry pi 4b. Will this sub for the offical power supply?
Thanks in advance!