6-pack of Pre-Assorted Colors. Intelligent head is smaller than Original Scuba head. Pack colors are pre-assorted and subject to change.Intelligent - soft or medium. 2 minute timer -- toothbrush beeps once and green light flashes once every 30 sec. to 2 minutes. 90 Day wear meter - after 180 uses the light changes to red to indicate time to check bristle wear. Depressing the button for 5 seconds resets the meter to zero. Replaceable heads - reduces environmental impact.More info, click here: Radius Toothbrush