Reset your shaver to new using this Philips SH90/70 Replacement Shaving Head for Shaver Series 9000 V-Track Precision PRO.Within two years your shaver heads cut 9 million hairs on your face. Replace the shaver heads and get back to 100% performance. Compatible with the Series 9000 Shaver.The upgraded solution makes the maintenance of your Philips Shaver easier than ever. This new format will allow you to install the new shaving heads in just two steps, facilitating thorough cleaning of the shaver and optimizing your daily shave.How to Replace: Pull the shaving head holder off. Replace the shavings heads with new ones. Reattach the shaving head holder. To reset the shaver, press and hold the on/off button for more than 5 seconds. After replacing shaving heads, you can reset the replacement reminder by pressing the on/off button for more than 7 seconds. Otherwise, replacement trigger will turn off automatically after 9 successive shaves. Get the perfect close shave. The V-Track Precision PRO Blades gently positions each hair in the best cutting position, from 1 day up to 3-day beard and even the flat laying and different length of hairs. Cuts 30% closer* in fewer strokes leaving your skin in great condition.