I have ordered EZ 3in1 from ndscardsale. The card worked, but did not save at all. I did a search on the net, and changed its battery but again it didn't work. Finally I found out that it has a defective SRAM, I checked it by a tester tool. 3in1 has 4 versions, mine has EZ5C11 chip, which is the one with highest failure rate according to comments on the net. Also, its browser and rumble functions do not work without patching with GBAExploader because the chip is not compatible. So seller should announce the version of 3in1, whether it is EZ5C10(old 3in1), EZ5C11 (mine lame one bought from here), EZC13 (new3in1) or EZ5C3 (3in1+ also has some compatibility problems). This is valid for all sellers, not just for ndscardsale. Beware, and do not buy EZ5C11 until unless you know what you are doing.