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 . 

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