By Cheyenne Macdonald

Whether you realize it or not, your fitness tracker could be leaking your personal data to anyone who knows how to access it.

A study from open Effect and the University of Toronto revealed that seven major fitness trackers leak data through Bluetooth, even after it’s been turned off.

The researchers found security and privacy issues in fitness trackers from Basis, Fitbit, Garmin, Jawbone, Mio, Withings, and Xiaomi, with Apple Watch being the only device in the study to earn a clean report.