Feature:1. 10 Natural Sounds: White noise machine features 10 natural sounds including white noise, ocean waves, birdsong, waterfalls, crickets, and running water2. 2 Lullabies: Sleep therapy machine has 2 lullabies, choose the sound according to your preference and create a quiet sleep environment3. Night Light Function: Sleep therapy machine has a practical night light function, convenient for mothers in the middle of the night for baby diaper change4. Compact and Portable: Natural sound sleep machine is designed to be portable and takes up very little space on the nightstand and suitable for travel carry5. Keeping Calm: Calming nature sounds help your baby stay calm while sleeping, and a good night's sleep for your baby means more sleep for the whole familySpecification:Item Type: White Noise MachineMaterial: PlasticProduct Size: Approx. 12 x 7 x 3cm or 4.7 x 2.8 x 1.2inBattery Type: Lithium Battery 5V 1200mAh (shipped with built in battery)Use Time: 15 to 30HCharging Time: 2H.Package List:1 x White Noise Machine1 x Lanyard1 x User Manual1 x USB CableNote:Shipped with built in battery