Advanced Bluetooth 5.0 Stereo Sound: Our sleep headphones feature updated BLUETOOTH 5.0 technology, which provides stable connectivity and smooth transmission at high speed and long distance with low consumption for stereo sound experience exceptional. You can listen to soft music without wearing extra headphones. High quality adjustable built-in speaker and microphone for hands-free and clear call. Innovative 3D contour design and no pressure on your eyes: This Bluetooth sleep mask is designed with breathable material and comfortable feelings. This mask also adopts ERGONOMIC 3D TECHNOLOGY for the eye area and blocks 100% of light to create an absolute dark zone. The sleep headphones eye mask perfectly solves the tightness of the silk eye mask, brings you a comfortable and long-lasting sleep. 10 hours of continuous play: our Bluetooth headphone masks offer an upgraded USB rechargeable battery, approximately 2-2.5 hour charge provides over 10 hours of play time. The Bluetooth mask will not beep to wake you up, you will sleep very well. Timer Function: Our sleep headphones also have a 1 or 2 hour auto off timer, Bluetooth headphones can play all night or turn off automatically according to your different needs. Press and hold the middle button to set the mode you want. Breathable and Washable: The 3D wireless eye mask with new design Velcro strap can be adjusted according to your needs. of head size from 20 to 28 inches. The adjustable non-slip hook and loop closure allows for a truly custom fit for Americans and fits most people (men, women, kids). The Bluetooth control module can be removed from the sleep mask, then you can wash the mask.