Dell AC adapter XK850 is a small portable electronic device for notebook, composed by fire-proof shell, power transformer and rectifying circuits. If you don’t have a battery installed, the laptop charger has played a more significant role on power supply. To reduce the computer weight, most of the adapters are external while XK850 is so weight that it won’t be your additional burden. Limited by 7.4 * 5.0 mm power cord, only the following compatible Dell models can be adapted to this charger. And the compatibility determination elements are more than the connector size. Distinct from universal chargers, XK850 in uniquely designed for XPS M1330, M1530, Inspiron 1750, 1545, 1318, 1440, 15 and 13. Especially for the output voltage 19.5V and current 3.34A, 65W has performed by different ways and limitation values are set accurately according to these compatible notebooks’ features. So, please buy a correct compatible charger for Dell instead of mix up with a wrong replacement even if it has the right connector.