1. Versatile Sleep Mask: Combines an ultra-thin sleep headphone with a 3D contoured eye mask for comfortable side sleeping. You can either play the built-in white noise and relaxing music to stay away from smart phone before sleeping or use the Bluetooth mode to stream your favorite music, podcast etc. 2. Buildt-in Soothing Sound : Features 20 built-in white noise and 4 relaxing music to help you drift off to sleep peacefully. Save the hassle to take out the phone so as to avoid the distrubance of the screen light before sleep.. 3. Wireless Audio: In addition to the built-in sounds, you have the option to stream your favorite music, audiobooks, or sleep sounds from your smart phone via the Bluetooth. 4. : Soft, stretchy headband provides a secure yet comfortable fit for most head sizes. In addition, you can adjust the position of the speaker to cover your ears for immersing sound effect. 5. Washable Eye Mask: With the removable speaker design, you can take out the speakers and the control unit so the eye mask can be washed separately to maintain personal hygienie.