Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
fitbit products using purepulse technology have a heart rate tracking feature that may pose risks to users with certain health conditions . 

```
. OPTIONS: ['Unilateral change' 'Jurisdiction' 'Choice of law'
 'Limitation of liability' 'Contract by using' 'Content removal'
 'Arbitration' 'Unilateral termination' 'None'].