How do I operate the FocusONE? Ashley July 26, 2018 20:29 Follow Please check out our User's Manual video below to learn how to operate your focusONE! Related articles Why is there play on the knob of my FocusONE? Is something wrong? Where may I purchase your products in Singapore? How do I attach the Focus Module on the HeadPLUS? My Focus Module skips teeth and does not stop at macro or infinity. What can I do? Do I need batteries for the Focus Module? Comments 0 comments Please sign in to leave a comment.