Feature: 1. 10 Natural Sounds: White noise machine features 10 natural sounds including white noise, ocean waves, birdsong, waterfalls, crickets, and running water 2. 2 Lullabies: Sleep therapy machine has 2 lullabies, choose the sound according to your preference and create a quiet sleep environment 3. Night Light Function: Sleep therapy machine has a practical night light function, convenient for mothers in the middle of the night for baby diaper change 4. 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 carry 5. 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 family Specification: Item Type: White Noise Machine Material: Plastic Product Size: Approx. 12 x 7 x 3cm / 4.7 x 2.8 x 1.2in Battery Type: Lithium Battery 5V 1200mAh (shipped with built in battery) Use Time: 15 to 30H Charging Time: 2H. Package List: 1 x White Noise Machine1 x Lanyard1 x User Manual1 x USB Cable Note: Shipped with built in battery