... at the same time ,the 5V voltage indication light up just offer the power for the digital products , ... the power , 5V LED light up, press for three seconds again, the 9V led light up , the DC port is ... again ,then transfer to the 12V indicator lamp light up, and the DC port is the 12V output ... switch again, the mobile power and the indication light also turn off .Annex Especially instructionAll output ...