The award winning bt-sonic isnew and improvedwith forward thinking design modifications that provide you with the best possible experience and results. The new cutting-edge engineering has resulted in a water resistance rating of IPx6, the highest level that you can achieve making it the perfect tool in any environment including the shower. The ultra-efficient micro sonic motor has been strategically engineered to reside in the base of the cleansing head, allowing for maximum oscillation, cleansing, decongestion and exfoliation. Because the bt-sonic cleansing brush uses Silver Ion technology, it is completely anti-microbial and anti-bacterial at all times! The bt-sonic is the professionals cleansing brush of choice in the United States, Asia and Europe.