I have used Rotadent for years until it finally wore out. I tried the Sonicare, but do not like the vibration, so I ordered this Rotadent, despite the bad reviews, and have been using now for 2 weeks, am very satisfied.
There are 2 brush speeds, Normal and Slow, and there is a 2 Minute timer, pausing in increments of 30, 60, 90 or 120 second intervals. Note: the brush will shut off after 2 minutes, 30 seconds, so know it's not the toothbrush, the timer expired. I love the rotating head, no vibration, and my teeth feel clean. Highly recommend if looking for a rotary brush head.