Unoisition beauty device with digital operation panel, slimming aesthetic instrument, fractional, power settings adjustable. - Brand: Unoisition - Setting Time: 60 minutes maximum - Attachments: Multiple attachments - Operation Panel: Digital operation panel High-frequency machine, hyper knife, cavitation introduction. *Cavitation may cause a high-pitched ringing sound that some people find unpleasant. The "ringing" sound heard during cavitation is mainly due to the phenomenon of "bone conduction," where ultrasound waves are transmitted to the bones in the body, which then resonate and reach the ears. There is no problem.