Try these checks first:
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Charge the belt for 2-3 hours before testing.
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Use a USB wall adapter, phone charger, or power bank rated 2.4A or higher. A low-output adapter may not charge the device properly.
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Check whether the blue indicator lights turn on while charging. Four blue lights means it is fully charged.
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Unplug the belt before testing. It cannot turn on, heat, or vibrate while charging.
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Hold the heat button for about 2-3 seconds to turn heat on. Short press the heat button after that to adjust the heat level.
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Hold the vibration/massage button for about 2-3 seconds to turn vibration/massage on. Short press the vibration/massage button after that to adjust the massage level.
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Do not press both buttons at the same time. Test heat and vibration separately.
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Make sure the USB-C cable is fully connected while charging.
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Test the red light in a darker room. The red-light LEDs are on the inside surface and can be harder to see in bright light.
If it still does not work, email support@daywick.com with your order number and a short video showing the belt unplugged while you test the heat button and vibration/massage button separately. This helps us review the issue and arrange the correct solution faster.