Mercedes owners, if you're dealing with a worn-out key fob or just want a spare, this 2-pack replacement set is exactly what you need! These are brand new remote keys that work with FCC ID IYZ3312 and compatible part numbers like 5WK4 7282, 5WK4 7283, and 2701 103 2302. They fit a ton of Mercedes models from 2000-2006 including C280, C320, CL500, CLK320, E320, ML350, and many AMG models too. Now, important note - these do need to be programmed by a professional automotive locksmith before they'll work with your car. But once programmed, they work exactly like your original key. The package includes two fully functional remotes with all the electronics already inside, and they've been tested before shipping to ensure quality. I love having a spare key - it's such peace of mind knowing I won't be locked out if I lose my main key. The buttons have that solid Mercedes feel, and the construction feels durable. They come with a 90-day warranty and the seller offers 24/7 customer service, which is reassuring. Just make sure your original key has the same button layout and part number before ordering. If you've been quoted hundreds at the dealership for replacement keys, this affordable 2-pack solution is definitely worth checking out - it saved me a bundle and works perfectly!