Sonic-FX Solo Electric Toothbrush - 3 Brushing Modes - with Intelligent Timer, Black. 33, 000 STROKES PER MINUTE - This Solo Electric Toothbrush is made to effectively clean teeth, gums, and tongue at 33, 000 strokes per minute than standard manual toothbrush. REPLACABLE HEADS - With a twist and lock mechanism to easily replace brush heads, this electric toothbrush from Sonic-FX is convenient and a practical choice compared to purchasing multiple standard toothbrushes. RELIABLE AUTO