Material: ABS+PC+silicone+electronic componentsSize: about 80*80*33mm/3.15*3.151.30inInput voltage: DC5VWorking voltage: 4.2vCharging current: 1APower: 1WBattery capacity: 1200MACharging method: USBCharging time: 1.5hUse time: 36hCertification: FCC/CE1.9 kinds of smooth and natural sounds: It features white noise, wave sound, birdsong, waterfall, cricket sound, bicker and 3 lullabies, so that you can choose sounds according to your preferences and needs to create a quiet environment for you to fall asleep quickly and rest completely .2.Portable design: Only 8*8*3.3cm. It takes up a small space on the bedside table and can be easily put into your bag or suitcase, making it the perfect travel companion.3.Not just for sleep: our white noise sound machine not only masks noise, improves sleep quality, but also is suitable for use at home, in the office, in a dorm, in a baby nursery or anywhere you want.4.Automatic shutdown timer: This white noise machine can be played continuously non-stop all night or there is an auto-off timer to set for 15, 30 or 60 minutes to conserve energy.(light display).5. It features a light display and according to the light, you can adjust the breathing in 10 minutes to make your body relaxed.6.It features built-in lithium battery and USB charging. It can be used continuously for 36h for a full charge.