This Model is a switching-mode power supply, operation at input DC voltage 11V to 16V and output DC voltage of 16V 18V 19V 20V DC at 4000mA load, with many protection functions use for the notebook computer, power supply by 12V car battery. Electric Characteristics: No. Item Specification 1. Rated Input Voltage DC12V Vibration Input Voltage Range DC11V-16V 2. Input Rated Current 8AMP Input Min. Current 100mA 3. Input Power 88W Efficiency 88 (TYP) 4. Output voltage:16V,18V,19V,20V(+ -0.6V NO LOAD) DC16V-20V 5 Output voltage:16V 18V 19V 20V(+ -0.6V 4A LOAD) Output current: 5A 16V/4.4A 18V/4.2 19V/4A20V(+/-0.6V 4A LOAD) DC16V-20V