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S9721, S9531, S9311, S7710, S6820
Fits S9XXXX or S8XXXX
SH70 or SH71 are interchangeable with the SH90 / SH91
1. Pull the shaving head holder off. 2. Replace the shavings heads with new ones. 3. Reattach the shaving head holder. 4. To reset the shaver, press and hold the on/off button for more than 5 seconds.