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This model is an universal switchiing-mode power supply for Laptop, operation at input AC 100v to 240V 47-63Hz, DC 7 Voltages: 12V/15V @ 4A max, 16V/18V/19V/20V @ 3.5A max, 24V @ 2.9A max output power 70 Watt max, with protection functions:Overload protection, Short circuit Protection, power supply by mains supply. With 8PCS tip connecter to suit to almost Laptops, Select voltage to suit to Laptop and make sure the polarity of tips connect correct before use.