Features 1. Various soothing sound sources, high-quality sound sources that cater to different populations, unique acoustic principles, and interior design allow us to fully release our body and mind like in the real world. 2. White noise is an acoustic term that simply refers to the flow, relaxation, and even sound of air in nature. It can effectively block high-frequency interference noise within a wide frequency range, giving you a quiet personal space. 3. Harmonious Sound: Enhance attention and enjoy efficient and comfortable sleep with white noise, lullaby 1, cricket calls, waves, clocks, bird calls, heartbeat, lullaby 2, running water, lullaby 3. 4. Improving work efficiency: White noise not only promotes sleep, but also masks the interference of external noise, helping us focus our attention during learning and work. 5. Convenient to carry: Convenient to tie up, hanging on the bedside and stroller, compact and convenient, can easily fit into a backpack or suitcase. Specification Material: Silica Gel+ABS Color: White Size: 9 x 8 x 3 cm Weight: 140 g Package Include: 1x  Portable Sound Machine