Make gum protector completely hard within 2 minutes. Items: 1. One pair of Whitening light with earphone a. 26 LEDs, Blue wavelength: 460~490nm b. Powered by 3 AA batteries and could work for about 1 hour a time c. link to your MP3 or MP4 during the treatment 2. Two pieces of Cheek Retractors 3. Two pieces of 35% Carbamide Peroxide Pens