Reduce the strong blue light on your smartphone to heal your eyes.
The biorhythm system is often at night and less during the day, reducing the proper amount of blue light.
Automatic on / off by timer.

What is a blue light?

Blue light is blue light with a wavelength of 380 to 500 nm, which is the shortest wavelength among visible light, and light with strong energy closest to ultraviolet light is blue light.
It is said to affect eye fatigue, sleep, obesity, spirit, cancer, cornea, retina.
Your smartphone contains a lot of this blue light. Care must be taken because the energy is stronger than other lights.
In order to shrink the pupils, the muscles of the eyes are overworked, resulting in tired eyes and stiff shoulders and necks.
At night, it is important to reduce the blue light stimulation as much as possible and rest your brain and body.