| 摘要 |
<p>A vibration device (10) for massage of a subject comprises a plurality of vibration arrangements (14) each operable, in use, to create vibrations for application to the subject. At least one of the vibration arrangements (14) is operable at a variable frequency and the variable frequency is settable substantially independently of the frequency of at least one other vibration arrangement (14) to create a variable beat frequency.</p> |
