Go to Amazon.com : http://www.amazon.com/gp/product/B00OVD8IDS?tag=theatrecat-20

UBatteries AC Adapter Charger Dell Inspiron M731R - 19.5V 150W

SELECT THE RIGHT AC ADAPTER RECOMMENDED BY LAPTOP MANUFACTURER
UBatteries Global AC Adapter Charger Including 3 Prung Power Cord
Input Voltage AC100-240V Frequency 50-60Hz
Output Voltage DC195V Output Current 77A Output Power 150W
Over Current Over Voltage Short Circuit Protect One Year Warranty 30 Days Return