Feature: 1. Automatically Turn Off Timer and Volume Control: Choose to continuously play relaxing sounds on this ambient sound machine or choose to automatically turn off the timer. The timer has three options, 15 minutes, 30 minutes, or 60 minutes. Use convenient volume control buttons to adjust volume. 2. Baby Sleep Aid: Add these rhythmic sounds to your baby's sleep program to help them fall asleep faster and sleep longer. It makes perfect baby sound machines and baby registration forms essential items. 3. 8 Natural Sounds: Eight natural sounds suitable for assisting sleep can effectively eliminate noise that may interfere or distract attention, thereby improving sleep and emotions. 4. Easy to Use and Safe to Children: Equipped with a convenient USB data cable. Simple interface for easy use and one handed operation. 5. Compact and Portable: This portable white noise sound machine is lightweight and compact, making it easy to fit into your bag or suitcase. Specification: Item Type: White Noise Machine Material: ABS Color: White Weight: Approx. 378g / 13.3oz Audio Source: Built In 10 Audio Sources Battery: 3 AA Batteries (Not Included) Timing: 15min, 30min, 60min Three Levels Timing Control Sound Source: Knob Control Sound Source. Package List: 1 x Host 1 x USB Data Cable 1 x Instruction