Concerning this item 16 POWERFUL LED BULBS — STARLITE SMILE Teeth Whitening Light 16 Blue LED Lights provide faster teeth whitening than UV light because their wavelengths are longer at 455 nm. The teeth-whitening process is accelerated by Starlite's light, which operates without a battery. FLEXIBLE, PORTABLE, SIMPLE — For a brief teeth-whitening session, plug in our tooth-whitening light anywhere. A mouth tray that fits all sizes is both cozy and simple to maintain. USB, USB-C, ANDROID, and iPhone connectors The LED mouth guard improves teeth whitening in 10 to 20 minutes each day, and the compact, lightweight teeth-whitening machine at home connects to most cell phones and USB devices. Simply add the gel or strips (separately sold; not included). Teeth Whitener Light never needs to be recharged or require batteries. Connect your gadget to it to whiten your teeth instantly.