Item Type: White Noise Machine Material: Plastic Product Size: Approx. 6.3 x 9cm / 2.5 x 3.5in Battery Type: 1 x Lithium Battery 18650 5V, Battery Capacity 2000mah (shipped with built in battery) Use Time: 5 to 10 Hours Charging Time: 3 Hours 110 Natural Sounds: White noise machine features 10 natural sounds including white noise, ocean waves, birdsong, waterfalls, crickets, and running water, which allows you to feel relaxed quickly 22 Lullabies: Sleep therapy machine has 2 lullabies, choose the sound according to your preference and create a quiet sleep environment 3USB Rechargeable: Music sleep aid machine has 2000mAh battery capacity (shipped with built in battery) and can be used for 5 to 10 hours on a 3 to hour charge 4Compact and Portable: Natural sound sleep machine is designed to be portable and takes up very little space on the nightstand and can easily fit in a bag or suitcase 5Keeping 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 familyShipped with built in battery 1 xWhiteNoiseMachine 1 x USB Cable 1 x User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.