16 Soothing Sounds: This baby white noise player has 16 built-in soothing sounds, providing a wide range of choices for your baby. These sounds quickly and effectively soothe your baby, making them feel happy and relaxed. Parents no longer need to waste time searching online for suitable sleep music for their baby, nor do they need to worry about their phone running out of battery. 3 Timer Functions: You can adjust the playback time of the white noise player for greater energy efficiency. You can set it to 15 minutes (red light), 30 minutes (green light), or 60 minutes (blue light). When your baby falls asleep, the device will automatically turn off and stop playing the sound when the time is up. Baby Night Light: This baby sleep aid can also be used as a night light, solving the problem of babies being afraid of the dark and creating a safer sleep environment. When turned on, the soft light automatically changes from dim to bright, and then from bright to dim. You don't have to worry about sudden changes in light affecting your baby's sleep. This product is perfect for use during nighttime breastfeeding or diaper changes. Long Battery Life: Our rechargeable white noise player has a built-in high-quality battery and comes with a micro-USB charging cable for convenient and fast charging. With its built-in 900Ah battery, this white noise machine provides up to 38 hours of continuous music playback on a full charge, or 24 hours with the indicator light on. The battery life is sufficient for night and day naps. Busy parents don't have to worry about power outages. Portable and Easy to Use: This white noise machine is compact, lightweight, and convenient. Its lanyard design allows it to be hung on a stroller or car seat, creating a quiet and comfortable sleeping environment for your baby at any time, freeing your hands and allowing you to enjoy your leisure time.