While there is some model confusion online regarding the Philips NL9206AD4
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Microwave Sterilization: If using the carry case, add the recommended amount of water (usually 25ml), place the soothers inside, and microwave (typically 750β1000W for 3 minutes). Let it cool for 5 minutes before opening.
Skin Adaptation: Philips manuals explicitly state that your skin may need 2 to 3 weeks to get accustomed to a new shaving system.