Sony SRS-XB13 Help Manual page 7

3.
Wrap the belt around your desired object, and then reattach the end loop of the belt to the hook.
Note
Do not use anything other than the supplied strap.
When you have attached the strap to the speaker, make sure that the end loop of the belt rests securely on the hook.
Do not pull hard on the strap attached to the speaker or swing the speaker around.
Do not use the strap with any device other than the speaker.
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