[ 10 Soothing Sound ] --- White noise sleep machine builtin 10 kinds of highfidelity natural background sounds. Music: "White Noise", "Lullaby 1", "Cricket", "Sea Wave", "Clock", "Bird", "Heartbeat", "Lullaby", "Stream Sound", "Lullaby 2" The relaxing nature sounds, helps your baby fall asleep faster and stay asleep longer whether it’s nap time or night time. [ Auto-Off Timer Sound ] --- Music sleep machine has a three modes of timer shutdown, 15 minutes, 30 minutes and 60 minutes, meet your different needs. Sound machine make you fall asleep easier and deeper. [ Compact & Portable ] --- Sleep sound device light weight and in small size, easy to carry. Suitable for use at home, office, dormitory, baby room or anywhere you want. And this white noise machine fits easily into your backpack or suitcase and makes it great for travel or in-office use to relieve anxiety and sleep better . [ With USB ] --- Sleep therapy machine easy to charge, long endurance. Made of high quality material, safe and ecofriendly, firm and durable. The simple interface is easy to use and operate. Our white noise machine can cover up the noise and improve the quality of sleep, make you sleep well. [ Instructions for Use ] --- White noise machine: 1. Press the power button for 1.5 seconds to start the machine, and then play the first piece of music. Short press is to pause, then press again to start playing. 2. Press and hold to increase the volume. 3. Press the timer button, once for 15 minutes, the green light is on, press again for 30 minutes, the blue light and green light are on at the same time, press again for 60 minutes, the green, blue, and red lights are on at the same time.