Professional Grade Cleansing Goes Ultrasonic Next generation bt-sonic reaches new elevation Seattle technology pioneer Bio-Therapeutic has reimagined the powerhouse behind their ever popular bt-sonic® cleansing brush, taking the handheld into ultrasonic vibration for an even more thorough level of clean without sacrificing portability or battery life. The next generation bt-sonic now features an upgraded powerplant, taking it from microsonic to ultrasonic oscillation with 24,000 vibrations…