This bestselling Teeth Whitening Light strengthens the whitening power of any Gel or Strips (not included). Its bluelight whitening power is activated by 16x powerful blue LEDs. Can also be used (without gel) to help treat and prevent gum disease. It's easy to use, just plug in to an iPhone, Android, or USB (4G or newer phones). And it works in as little as 10 minutes per day. It comes with a comfortable mouth tray which prevents leaking.