Hey Cadillac STS owners! If you're tired of dealing with a worn-out key fob or need a spare, this 2-pack replacement set has you covered. These are perfect for your 2005-2007 Cadillac STS and replace part numbers M3N65981403 and 15212382. Each fob comes completely assembled with electronics, ring loop, and battery already installed - so you're good to go right out of the package. Now, here's what you need to know: the key blade needs to be cut to match your existing key, and you'll need to visit a dealer or locksmith to get it programmed to your vehicle. But once that's done, you'll have two fully functional remotes that work just like the originals. Having a spare key fob is seriously smart - lose one and you're not stuck paying dealership prices for an emergency replacement. The build quality feels solid, and the buttons have that responsive click you expect from a proper remote. Perfect if your current fob is getting worn, buttons aren't working reliably, or you just want that peace of mind of having a backup. Much more affordable than going through the dealership, and you get TWO for the price most places charge for one. Just remember to get them programmed professionally - it's quick and ensures they work perfectly with your STS's security system.