High-level DC output Voltage to choose from: 18 V, 19 V, 20 V, 21 V Maximum current: 4 A Medium-level DC output Voltage to choose from: 9 V, 10 V, 11 V, 12V Maximum current: 2 A Low-level DC output Voltage to choose from: 5 V, 5.5 V, 6V, 7V Maximum current: 1 A Short circuit protection Against overheating