A secured transaction is a transaction that is founded on a security agreement. A security agreement is a provision in a business transaction in which the obligor, or debtor, in the agreement gives to the creditor the right to own property owned or held by the debtor.
If your brush has two speeds, and uses brush heads with slim-angled necks, then you have a Sonicare Elite. An Elite toothbrush has a thread collar screw on brush head.
A second review found no clinical evidence for the dynamic fluid activity of the Sonicare toothbrush being more effective in plaque removal than an Oral-B oscillating/rotating electric toothbrush. A 2007 study comparing the two found the rotation/oscillation brush to be more effective in single-use plaque reduction.