Stereo Speakers & Bluetooth 5.0: This white noise machine has two super full frequency Hi-Fi Speakers, perfect high fidelity sounds guaranteed, and immersive listening to nature. It also supports Bluetooth 5.0, so you can connect to your phone and play your favorite music. There is a 3.5mm headphone hole on the back of the device, which can be connected to headphones for use.
DIY Sound & DIY Mood: This sound machine allows for the free combination of multiple natural sounds. The 8 classical nature sounds include sea waves, Alpha, Running Water, Thunderstorms, Campfire, Birdsong, Crickets, and White Noise. Up to 255 soothing sounds can be produced in your DIY intermix. You are free to mix and match according to your needs.
Timer Functions: This white noise machine has Timer Functions. 30/60/90mins timer function, you can set it according to your needs. When turned off automatically, the sound will gradually fade out and then turn off without waking you up in your sleep.
Built-in Powerful Battery & Rechargeable: This white noise sound machine has a built-in powerful 1800 mAh battery that can be used continuously for more than 10H with full charge. No need to worry about running out of power. Perfect for your office, home, bedroom, or travel.

Use innovative Bluetooth 5.0 chip, links basic not delay, distance are closer and more stable