... decrease or increase gradually and smoothly.4. Four natural sounds for waking up or falling asleep ( Bird, Frog, Brook, Sea wave ... of timer, related to sound, volume and light, used for Auto-Off or Auto-On function (OFF,15,30,45,60,75,90 ... set as alarm ), 87.5~108MHz or 76~108MHz options, auto scan the radio frequency10. Three steps of LCD backlight(full ...