26 SOOTHING SOUNDS: AVWOO sleep sound machine has 7 white noise, 7 fan sounds, 2 Plane Sounds, 2 Lullabies and 8 relaxing natural sounds (Thunderstorm, Ocean Wave, Brook, Wind, Cricket, Campfire, Rain, and Tibetan Bowl). All sounds are crisp, natural, realistic, and free of scratches. Select your favorite sound and get ready for your personalized sleep therapy! 2 IN 1 FUNCTION: This device can not only work as a white noise machine, but also a Bluetooth speaker! With sleep aid mode, you can enjoy a night of deep sleep without grogginess and drowsiness. With Bluetooth mode, you can play music from your Bluetooth-enabled device and enjoy amazing listening experience. To transform the Bluetooth mode and sleep aid mode, you just need to long press mode button. BUILT IN MEMORY CARD: This sound machine is built-in 8G memory card, which enables you to add your favorite sounds or music to this device. These sounds or music can be played by pressing edit button. This device can also be used as a computer speaker when you connect it to computer with USB cable in original package.