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