This light CONNECTS right up to your Phone or USB Adapter. The LED’s are as powerful as a dental office whitening session. It has 16 LED's in the top and 16 LED’s in the bottom of the tray and connects right Up to your device. It is compatible with any I Phone 5 or newer and most android phones. This device typically uses 3-5% battery in 15 minutes of use while plugged into your phone. Kit includes 30 teeth whitening treatments. A detailed instruction manual is included. Super easy to use! Enjoy!