What is the difference between an adapter with two prongs and an adapter with three prongs? An adapter with three prongs has an extra line which connects to the ground. This can protect you in the event of electricity leakage and/or static electricity. This adapter has been tested and is guaranteed to work with the compatible laptop models. Compatible Models: Dell XPS M1210 / M140 / M1410 / M1530 / M1020 Dell Inspiron E1405 / E1505 / E1705 /1420 / 1150 / 14 / 12 / 1750 / 1318 / 1410 / 1425 / 1401 / 1427 / 1440 / 1721 / 1720 / 13 1525 / 1520 / 1501 / 1521 / 1526 8600 / 8500 600M / 700M / 710M / 640M / 500M / 300M / 505M / 630M / 510M / 610M 6000 / 6400 Dell Latitude X300 / E4300 Dell Vostro 1400 / 1000 / 1500 / 1310 / 2510 / 1200 / 1510 / 1320 / 1220 Dell M109S Projector
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