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By Lucy Bayly

New details were released Tuesday about the McDonald’s recall of its “Step-It” toy fitness tracker, a digital device intended to be included in millions of the chain’s Happy Meals.

“McDonald’s has received more than 70 reports of incidents, including seven reports of blisters, after wearing the wristbands,” wrote the Consumer Product Safety Commission in its official product recall.

The restaurant chain first announced the recall last week after several parents took to social media to post graphic images of their children’s skin rashes, which were thought to have been a reaction to contact with the battery on the back of the activity band.

Read More: McDonald's Pulls Fitness Tracker Toy After Reports of Skin Rash

The scope of the recall has also now been revealed – 29 million units across America and Canada, distributed between August 9 and August 17, 2016.

The CPSC advises consumers to return the plastic light-up band to a McDonald’s for a free replacement toy and “either a yogurt tube or a bag of apple slices,” or call McDonald’s customer service at 800-244-6227 from 7 a.m. to 7 p.m. CT.