Crest 3D White's new, unique blue light system uses the same type of light technology dentists use. The blue light weakens stains so that the whitening ingredient can work more effectively. The result is dramatically better whitening compared to strips alone that lasts up to 36 months. Includes: Whitening Strips, Whitening Unit, Instruction manual Health Concern: Teeth Whitening Product Form: Strips Material: Plastic Suggested Age: 18 Years and Up Battery: required, included: Product Warning: no warning applicableCrest 3D White Whitestrips with Light - 10ct