Specification: 6 Powerful LED tubes emit a high intensive cold blue light with an output at 4800 MW/CM2 Ring-style lamp oxidizes 16 or more teeth Enjoy a wide range of whitening gels because of its 8 time pre-set programs and 3 different light intensity outputs Make a beep every 5 minutes for warning , and a"three beep" warning indicates the ending of the whole whitening process 20s and 30s time presetting modes apply for the solidification of the gingival protectant LCD screen shows all the information for better communication between the dentist and the patient With an average of 10 shades , you can finish the full teeth whitening at one time.