PHOTO: Dina Mitchell shows a picture of her Fitbit after it allegedly caught fire.

A Wisconsin woman said she suffered second-degree burns on her arm after her Fitbit tracker exploded. Dina Mitchell said she had owned her Fitbit Flex 2 for about two weeks when the fitness tracking device allegedly caught fire on her arm while she was reading a book on Tuesday night.

http://abcnews.go.com/US/woman-sufferd-2nd-degree-burns-fitbit-exploded/story?id=46977279