... decrease or increase gradually and smoothly.4. Four natural sounds for waking up or falling asleep ( Bird, Frog, Brook, Sea wave ... steps of timer, related to sound, volume and light, used for Auto-Off or Auto-On function (OFF,15,30,45 ... radio frequency10. Three steps of LCD backlight(full, half , off), memory will record the previous LCD brightness11. Snooze function, 5 minutes12. AC adaptor power ...