Bio-Therapeutic bt-micro The bt-micro is the ultimate in hand-held professional technology that offers ultrasonic exfoliation using forward-thinking, patented technology.bt-micro ultrasonic exfoliation works by creating high speed oscillations, leaving skin smooth, fresh, and perfectly prepared for product application. The bt-micro is powered by a rechargeable battery and is compact and lightweight. Want to read more? Subscribe to one of our monthly plans to continue reading this article.