S-/S+ Control the speed of the starlight The speed of nebula changes every time you press it by one level, up to level 4. "B-/B+" Adjust the brightness There are 5 levels of nebula brightness. The default brightness is the middle level. Each time you press it, the brightness will increase by one level. "NEBULA" Each time you press the button, the nebula switches a color(A total of 8 modes) Long press the button to turn off nebula. After closing nebula, short press the button to re-open nebula. "STAR" The stars have three modes The first is the stars always bright, the second is the breathing rate 1 mode of the stars (default), the third is the breathing rate 2 mode of the stars (faster).Long press to turn off the stars, short press after closing to turn on the stars again (default mode).