Need a replacement key fob for your Smart Fortwo? This KR55WK45144 remote is exactly what you're looking for! It's designed specifically for Mercedes Benz Smart Fortwo models from 2008-2015 and works with part numbers KR55WK45144, 267T-5WK45144, and TA-2007/080. The 4-button remote operates on 315Mhz frequency and comes with the PCF7941 chip already installed. Important note though - this is a replacement part that needs to be programmed by a qualified locksmith or dealership, and the key blade will need to be cut to match your vehicle. It comes with the 3V lithium battery installed, so you're ready to go once it's programmed. The size is compact at 3.94x1.77x0.39 inches, making it easy to carry. Seriously, if you've lost your original key or need a spare, this is a much more affordable option than going directly to the dealership. Just make sure to have a locksmith check that it can be programmed to your specific vehicle before getting the key cut. It's one of those car accessories that can save you hundreds of dollars while giving you back the convenience of keyless entry and remote start functionality. Always good to have a backup key!