Ultrasound hair removal is a scam. It was driven by Applisonix, who produced pseudo-scientific studies (not peer reviewed) that were solely aimed at driving up the stock price. Applisonix exploded on the scene back in 2011, quickly shot to a peak of interest, then collapsed as actual field effectiveness was found to be very, very low, which in turn collapsed the stock. Of course, the scammers didn't care. They'd started the company, sold all their stock to suckers, and walked away wealthy.
I would advise reconsidering ultrasound hair removal and anyone claiming to provide that service.