About this item Thin Speakers and Bluetooth V5.2 Superior Sound Quality: The thickness of this sleep headphones Bluetooth eye mask is only one-third of the average speaker, making it very comfortable for side sleepers. With Bluetooth V5.2 technology and high-quality components, this model produces incredible sound quality with deep bass and crystal clear treble. 2 Hours Charge for more than 9 Hours Playing: Built-in premium high-performance battery. Updated capacity from 200mah to 240mah; charges via USB cable. A charge of about 2-2.5 hours can provide more than 9 hours of playing time. If you fall asleep with it on and the battery runs down, this sleep mask with Bluetooth headphones wont beep to wake you up, allowing you to sleep peacefully all night. Block Out Light Ideally: Wearing this sleep headphones eye mask, insomnia will disappear as you allow your natural melatonin to flow and drift to sleep. With a total block-out design, this Bluetooth eye mask is perfect for relaxation, ai