1、WHITE NOISE MACHINE: The white noise machine includes 8 digitally recorded relaxing sounds designed to mimic the nature environment, wind, heartbeat, ocean, stream, dripping water, birdsong, summer night, white noise. 2、BABY SLEEP ASSISTANCE: Add these rhythmic sounds to your baby's sleep routine to help them fall asleep faster and stay asleep longer. 3、AUTO OFF TIMER AND VOLUME CONTROL: Choose to play relaxing sounds continuously on this ambient sound machine or select the auto off timer; timer with 3 options, 15, 30 or 60 minutes; knob button to adjust volume. 4、USB RECHARGEABLE, WIDE SCENARIO: Portable white noise machine with built in rechargeable battery, USB rechargeable, more convenient, portable sound treatment for home, office, daycare center. 5、COMPACT AND PORTABLE: This small travel white noise sound machine is lightweight and compact, easily fits into your bag or suitcase. Item Type: Portable White Noise Machine Material: ABS, Silicone Weight: Approx. 287g/10.1oz Size: Approx. 14x14x4.5cm / 5.5x5.5x1.8in Timing: 30min 60min 90min Battery: Lithium Battery 1200mAh (Included) Volume: 1 Percent~100 Percent Built In 8 Sounds, Independent Playback 1 x Portable White Noise Machine 1 x USB Cable 1 x Instruction Manual