This best-selling LED teeth-whitening accelerating light gives your smile a brightening boost. Specifically shaped and created for uniform whitening, this LED light activates whitening gel and accelerates the whitening process. Type of supply: LED activating light Blue light frequency of 465-470 nanometers (similar frequency to dentist light) Compact Directions Place against teeth whitening trays, or use with paint on gel. 10 minutess. May be used daily Due to the personal nature of this product we do not accept returns.