I bought this item to power my Samsung Q45. In spite of a previous review (from "L D") claiming that this purchase would support a Samsung 19V, 4.74A, I found no tip that would fit. In fact the range of tips is quite limited and none would fit my wife's Lenovo laptop either. In any case, the polarity of the tip was incorrect for both laptops and, oddly, there is no way of changing the polarity (as pointed out by reviewer "bear").
However, it should be pointed out that this item is very cheap. I was able to use the money I saved on this purchase to modify it to my needs. With a soldering iron and a trip to Maplin I was able to buy the correct tip for my laptop and wire it up with the correct polarity. It now works perfectly and the total cost to my pocket was less than £10. For that reason I give this 3 stars.
If you're not capable or prepared to modify this item I suggest you contact the vendors directly and specifically ask whether it is compatible with your device.