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' 'Jurisdiction' 'None' 'Contract by using'
 'Choice of law' 'Unilateral change' 'Arbitration'
 'Limitation of liability' 'Content removal'].