IMPORTANT: Read and follow the operating steps below instead of the steps in the manual. OPERATING STEPS: ? Apply the whitening gel thinly and evenly onto the luminescent surface of the cold light dental tray with a thickness of about 1mm. ? Plug the cold light dental tray into second/lower port of the time controller power device. Then tap and hold the switch to turn on the power, the time controller power device will display the countdown of 30 minutes. The cold light dental tray will emit bright blue light. ? To adjust the light time, press and hold it to set the preferred whitening time. 30 minutes is recommended. ? Dry the teeth surface with a clean paper towel, put the cold light dental tray into the mouth, and gently bite it, bringing the teeth whitening gel close to the tooth surface. ? After the preset whitening time elapses, the time controller will automatically shut down. This product is tested and approved by the national quality inspection department and also obtained the EU CE certification. VIAI.LA uses dentist grade professional whitening gel with LED light to maximize the efficacy by about seven shades lighter depending on the duration of each session and how often it's used. VIAI.LA is similar to professional machines in high-end dental clinics except the bulbs and the concentration of the gel are slightly lower to make the device portable and convenient for home use. The main ingredients are: Pharmaceutical-grade hydrogen peroxide, carbomer, nano S1O2-05, WDJ-38, glycerol, potassium sorbate, xylitol, mentha camphor, seasoning and deionized water. Designed and gel formula made in USA. Assembled in China.