Fitbit is currently facing a lawsuit from several users claiming that the company's health tracking devices are not reliable and cannot be trusted when it comes to monitoring their heart rates.

The heart monitoring devices of FitBit is labeled as "very inaccurate: in a filed lawsuit complaining the manufacturer of false advertising.

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The company is known for manufacturing fitness trackers, however the devices sold as said to be inaccurate in recording hearth rates, while on the chance of risking users' health, based on the case filed to a federal court in San Francisco.

The plaintiffs have filed a class-action lawsuit in California claiming that Fitbit Charge HR as well as Surge models consistently giving them inaccurate heart rates during workouts, CNET reported. The lawsuit claims that apart from plaintiffs, there are also a lot of other consumers have experienced the same issue and testing also confirmed that the PurePulse Trackers consistently mis-record heart rates by a huge margin, particularly during workout sessions.

More so, the suit accuses the company of fraud and customers seeks an award of compensatory, monetary and punitive damages based on the lawsuit, which was filed on Tuesday. The price ranges from $150 to $250 for both Charge HR and Surge devices.

Teresa Black from Colorado, one of the plaintiffs, claims that her Charge HR significantly understated her heart rate during her personal training session in June 2015, 10TV reports reported. She said that her personal trainer recorder her heart rate manually at 160 beats per minute while her Fitbit device only indicated a total of 82 bpm, which is the normal range for a person who is at rest.

Of course, FitBit defends its products, saying that they conducted internal researches to prove their accuracy. According to a representative for the company, they don't believe that there is a case. They strongly believe that their heart rate devices are counting accurately and disagree with the filed complaint and plan to file a counter case, while defending FitBit in the lawsuit.

In the same report, the company stated that they do not believe that the case has merit. They also said that the company stands behind their heart rate technology and strongly disagrees with the statements made in the complaint and that they are planning to defend the lawsuit.