Plug the LED teeth whitening device into your smartphone or tablet (it is compatible with iPhone and Android devices using the included adaptor). Press the power button on the cord to start the LED device and insert the device into your mouth. The device will beep once after 5 minutes to let you know it's halfway through treatment. After 10 minutes of treatment the LED device will beep twice and power off on its own. Remove the LED device from your mouth and disconnect it from your smartphone or tablet.