Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
the maintenance and security of this equipment may influence the performance of the fitbit service and it is your responsibility to ensure the equipment 's functionality . 

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