Here is a question from Yocan UNI user:
I just bought an UNI.. it won't turn on... I tried charging but still won't turn on...
Please check the cable, plug it into the USB charging port, the indicator light should be flashing.
Once it is fully charged, the light will be shut off.
As for your device, any indicator light when you hit the fire button?
If not, this item may be a malmanufacture item.
Please ask the head shop to check and change another one.
If your device still can' t work, please contact our after-sale team at firstname.lastname@example.org