I just bought the one from Eufy and it didn't come with a wall wart. I used the wart that came with a lamp. The lamps is plugged to the USB port on my sit-stand

I just bought the one from Eufy and it didn't come with a wall wart. I used the wart that came with a lamp. The lamps is plugged to the USB port on my sit-stand-desk. When I raise and lower the desk, the lamp lights up. That might not be the power port, it may be the "induction" power button on the lamp's chord getting interference from the desk motors. I'm living the tinderbox life.