By 3 News online staff
The firm which makes the flashing wristbands given out at gigs on Coldplay's current tour has moved to quash rumours they're actually mind control devices.
The denial comes after fans reported the wristbands, which flash in time with the band on stage during the show, came back to life days afterwards.
"My xyloband woke me up in the middle of the night and it's still glowing," fan Denise wrote on the Coldplay website.
"Really weird, my dad's white xyloband just started flashing again," said another.
And from Belgium: "Mine is alive! It started flickering about an hour ago."
One fan said the only way he could get his to stop flickering was to jam a pencil in it.
Clive Banks, co-founder of the company that makes the bands, RB Concepts, says fans needn't be worried.
"There's no mind control or tracking, they are just for fun," says Mr Banks, who says they're probably being activated by nearby Colplay gigs.
"Our record transmission is 2km," he says. "It depends on buildings but they have quite a range in a straight line. There might be some faulty units going off."
Another possibility is they're being activated by stray radio waves.
"They operate on different frequencies in different jurisdictions so we have to get permission to transmit," says Mr Banks. "We have to meet the health and safety requirements.
"We don't want to interfere with any emergency services."
Eventually, the bands should go dark when their batteries run out.
3 News