【Wide Compatibility】: Compatible with multiple Braun electric shavers, including 5020S, 5030S, 5040S, 5140S, and 5147S. This is a replacement part and not an official product. 【Easy Replacement】: Replacing the blades is very easy; simply remove the old head and lightly attach the new one to easily refresh your shaver. 【How to Check the Model Number】: You can check the model number by looking at the front or back of the shaver head. If there is a sideburn trimmer, you can see the blade part by lifting the trimmer. 【Recommended Regular Replacement】: To maintain the best shaving performance, we recommend replacing the blades and foil every 18 months. This will prevent a decline in shaving quality. p03619