I am unaware of any system currently purporting to utilize ultrasonic for the purpose of hair removal. I would think that it would be difficult to create the amount of heat needed, while concentrating that heat energy in the target area, without spillover to tissues one does not want to be damaged... but perhaps we have said too much... There may be a scammer reading this right now and saying, "Eureka! That would be a new scam that would sell millions! Just modify one of those toothbrushes, and sell them for $100 each and retire to the South of France by next year!"