McDonald’s food isn’t exactly the healthiest choice for kids—and apparently the same can be said of the restaurant’s fitness trackers.

The wristband toys given away in the fast food chain’s signature Happy Meals were intended to help get kids moving. Instead, the toys have gotten company officials racing to issue a recall after the devices were found to burn and irritate kids’ skin. So far, there have been 70 reports of injuries from the colorful gadgets, including seven reports of blistering burns.