There is a sensor on the inside of the device that only allows light to be emitted when the cap is on the head. As an eye-safety precaution, if the device is not on your head when you turn it on, the lasers will not stay on. When you place the cap on your head, the sensors are triggered, and the laser dome will turn on. Please refer to page 6 of your manual.
I didn’t receive a manual.
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