Review (5/5): Toothbrush exceeds functions
This unit has 3 speed settings which provide flexibility when having sensitive gums or fast speed to do a thorough job of cleaning. I have not used the polishing setting. The 30 second timer is helpful in providing a signal when to move on to another quadrant. The charging light goes off after fully charged. I do run the battery down from time to time to make sure the battery life is maxed out. A red light comes on to help determine when charging is needed. I believe you should run the battery all the way down once a year.