The Hushh has a child-safe setting to lock it in an off or on position safe from small hands who may try to play with it while in use. If the control buttons on your Hushh unit appear to be non-responsive, it very may likely be in the locked setting. To remedy this, press the "Power" and "Select" buttons at the same time and hold for a few seconds until you see the indicator light blink three times. After you do this step, try to adjust the volume to see if you've unlocked the unit. Voila!