Name:Sleep Machine White Noise Machine Sleep Sound Machine For Sleeping & Relaxation for Baby Adult Office Travel. Built in USB Timer Product parameters: Material: ABS+PC+silicone+electronic components Size: about 80*80*33mm/3.15*3.151.30in Input voltage: DC5V Working voltage: 4.2v Charging current: 1A Power: 1W Battery capacity: 1200MA Charging method: USB Charging time: 1.5h Use time: 36h Certification: FCC/CE 1.9 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. 1*Machine 1*USB 1*Instruction manual