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Hello RushFan, The z150 Speakers don't have an on/off switch---the knob is simply for raising or lowering the volume. For more specifications, here's a link to the product page for the z150: https://support.logi.com/hc/en-us/articles/360024152174-Getting-started-Multimedia-Speakers-Z150. Hope that you find this helpful and that all is going well. - Richard from Logitech
Sorry, there was a problem. Please try again later.Yes, turn the knob to turn on and off and to control volume.
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