Mini home teeth whitening light Voltage: DC 6V LED lights: 1 Blu-ray intensity: 400-600 mcs Blue wavelength: 460-465 nm Two color choices: white / blue Two button batteries, lasts 48 hours Instructions: After applying whitening gel, whitening lights on, put in the mouth irradiation; White light emitted blue light will begin to react with the gel, thereby whiten teeth. A whitening lamp illumination time of 10 minutes, For prolonged exposure, after the completion of irradiation once again open to be extended by 10 minutes. This whitening light for home whitening, convenient and safe. The first time you use whitening lights, open the rear battery cover, two button batteries in the middle of the gasket removed, replace the battery, it can be used.