There are at least two, and maybe more remote models that LOOK the same but use different codes to send signals. You tell the difference by looking at the 7 digit part number on the back (in very small letters). I do not know how you would know which one is correct if you have none to start with. The number on ours is 9148646. It has two small white buttons (some have sightly larger white buttons then other), lock on the upper left and unlock on the upper right. The other one looks the same but the number is 3545653. I have seen other styles where one button is over the other, but they seem not as common and may be for cars with a different lock, like a deadlock for instance. Good luck!