Question: what is 12v 2a output?
Answer: It's simple: The output of the supply is 12 volts, and it can give 2 amperes of current continuously. It can't give more than around 2.1 amps (maximum, I mean I am not even sure it can go up to 2.1 amps. ... The output of the supply is 12 volts, and it can give 2 amperes of current continuously.