Manufacturers of smart wristbands and watches do not properly explain how they guarantee the privacy of users who share sensitive data about sleep rhythm and heart rate, for example, the

Financieele Dagblad



) concluded on Thursday based on their own research.

The business newspaper investigated the privacy policy of Apple, Garmin, Xiaomi, Huawei and Polar, among others.



concludes that many conditions contain vague or confusing descriptions of how the gadgets collect or process data.

For example, Garmin improves "functions and services", Xiaomi says it will share the data with "business partners" and Huawei uses the data for "business support".

Apple, which profiles itself as a company that values ​​privacy, reports that data can be used to "improve products and services."

It is unclear whether the manufacturers violate the European privacy rules of the General Data Protection Regulation (GDPR).

It states that companies must clearly explain what happens to data, but the Dutch regulator did

not want to respond to the investigation

to the



It is unclear whether the practices are being investigated by a European watchdog.

Manufacturer Fitbit is under a magnifying glass from Brussels, which is investigating the planned acquisition by Google.

The European Commission is investigating what it would mean if Google enters the fitness tracker market and thus gains access to health data, among other things.

See also: What happens to my data?

And other questions about Google's Fitbit acquisition