Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
to enjoy headspace via your smartphone or other device , your device must satisfy certain system requirements . 

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