... protection, Voltage protection, Short circuit protection, Hot seller,Price advantage. Laptop adapter:Input :100-240V 50-60Hz 1.5AOutput:19V2.1ADC interface ... with over-voltage, over current, short circuit protection;3, Output power enough;4,The output voltage accuracy;5,The output voltage ... is small;6, Original standard design, 100% compatible with original power supply. 40W 19V2.1A for laptop adapter