We're sorry to hear that your laser cap is not turning on. Please try the following: 1. Fully charge the battery using the USB Type-C cable. 2. Check that the battery is properly connected to the cap. 3. Press and hold the power button to turn it on. 4. If it still doesn't respond, try another compatible charging cable and power adapter. If the battery still won't turn on, please contact **service@freyara.com** with your order number and a short video showing the issue. Our after-sales team will help troubleshoot and arrange a replacement if necessary. 

The LLLT laser cap does not have a vibration function, but it provides vibration feedback when changing settings. If convenient, please contact us via email. We can also provide a video to help you troubleshoot the problem. 

Discount codes are used on the checkout page.