This is a AC Adapter for Dell Inspiron 1520 1521 1501 1505 PA 12. The power output is 65 Watts and 19.5 Volts. Input voltage 100-240 Volts. Output amper is 3.34A and the diameter is 5.0 mm X 7.4 mm. This ac adapter has built in surge and overcharge protection to ensure the safety and performance of your PC.