Make your shaver like new Replace shaving heads every 2 years for best results In two years, the shaving heads have shaved 9 million facial hairs. Replace the shaving heads and get back 100% performance. Compatible with the 3000 and 1000 series shavers. CompatibilityThe extra SH30 shaving heads (3-pack) are compatible with the 3000 (S3XXX), 1000 (S1XXX) series shavers and the Star Wars shaver SW3700. Replacement reminderThe latest Philips shavers have a built-in replacement reminder in the form of the shaving head symbol. This symbol lights up so you know when it's time to replace the shaving heads. Easy to replace1. Open the shaver by pressing the release button2. Remove the holder by turning the lock anti-clockwise3. Take out the old shaving heads and carefully insert the new ones. Make sure the heads are inserted exactly into the setting4. Replace the container and secure it by turning the lock clockwise5. When you close the shaving head properly, you will hear a click. Make your shaver like newThe latest Philips shavers have a built-in replacement reminder that indicates when it is time to replace the shaving heads. Once you have replaced the shaving heads, you can reset the replacement reminder by pressing and holding the on/off button for at least seven seconds. Otherwise, the replacement reminder will automatically turn off after nine consecutive shaves.