Long Playing Time: Upgrade Micro-usb chargeable battery, Built-in 200mAh high-performance battery,Charging time about 2-2.5 hours,A fully charged battrey can be provide more than 9 hours playing time, won't be waked up at night,enough to support the whole night.We have a humanize design,if you fall asleep with it on and the battery runs down ,this bluetooth eye mask won't beeps to wakes you up. you will have a very good sleeping. Stereo Sound with Thin Speakers: Thickness is only one-third of the average speaker,it is very comfortable for you. Devices can great compatible with your iPhone XR,iPhone XS,iPhone X,iPhone 8,iPhone 7,Galaxy Note9 or any other Smartphones iPad Tablets easily.It is the best Christmas gift for family or friends on travel and airplane. Comfortable Material and Washable: Music sleep headphones is made from 5% Polyester and 95% elastic cotton, and provide a soft and comfortable feeling. Fabric liner separated from stitching is not defective,it is the place to take out the devices Module, so you can full wash the eye mask.Velcro is adjustable. Size and Speakers Adjustable: Size is 20.3-26.5inch/ 51.6-67cm ,Velcro is adjustable, also fit big heads,the delicate wiring connected to the speakers that go from ear to ear is very sturdy, you can adjust the position of the speakers for your ears to hear more clearly.It is very important to adjust the position of the headphones before use. Keep Deep Sleep: Block light to make your sleep better, allows you to listen to music without wearing additional headphones, which make you fall asleep faster. Extra cushion makes eye mask and nose touch better, which can be completely shaded. Best for frequent flyers to sleep on long flights or sensitive sleepers (insomnia) who dislike glaring lights in any occasions. Sleep in a light blocked world whenever and wherever. Perfect for air travel, relaxation, meditation, insomnia.