1、Uses two induction mode - sound and light, to help people with sleep difficulties to improve the quality of sleep 2、Sound mode: various white noise sound help you relieve your nerve and improve your sleep quality 3、Light mode: breathing projection lights have certain alleviate effect people with insomnia 4、With timer function, you can set a time for sleeping and the machine will shut down automatically after the set time is reached 5、Volume adjustable, you can adjust the sound volume via the buttons on the side This white noise machine is specially designed for sleeping and relaxation. It can help to improve sleep quality, block the noise and improve work efficiency. Features: Uses two induction mode - sound and light,  to help people with sleep difficulties to improve the quality of sleep. Sound mode: various white noise sound help you relieve your nerve and improve your sleep quality. Light mode: breathing projection lights have certain alleviate effect people with insomnia. It can help to improve sleep quality, block the noise and improve work efficiency. With timer function, you can set a time for sleeping and the machine will shut down automatically after the set time is reached. Volume adjustable, you can adjust the sound volume via the buttons on the side. Turn on and off: Turn on the power switch on the bottom of the device, press and hold the touch screen for more than 2 seconds, and the device starts working. The device is in working, long press the touch to turn off the device. Time Setting: When the device is working, press the touch screen once to set the "timing time"to 10 minutes. Press the touch screen twice to set the "timing time" to 20 minutes. Press the touch screen 3 times continuously to set the "timing time". Set to 30 minutes. Specification: Condition: 100% Brand New Item Type: White Noise Machine Material: ABS Item Color: White Input voltage: 4.5v Working current: < 100mA Power supply: 3 * AAA batteries (not included) Headphone jack: 3.5mm Size: Approx. 125 * 55mm / 4.92 * 2.17in Weight: approx. 145g Package List: 1 * White Noise Sound Machine 1 * Manual