This eye mask adopted 3D ergonomic technology for eyes area and block out 100% of light to create absolute dark zone and listen to music without wearing additional headphones for you sweet deep sleep, great solution to the problem sleeper. Perfect for home, office, air travel, business strip, relaxation, mediation and insomnia.Featuring bluetooth 5.0 technology, stable connectivity and smooth transmission in high speed and long distance with low consumption for great stereo sound experience.Built-in the premium high-performance battery charge about 1-2 hours, provide more than 10 hours playing time, wont be waked up at night, you can sleep peacefully all night.Sleep headphones bluetooth sleep eye mask is designed with breathable material and comfortable feel, breathable slow-rebound memory sponge and smooth fabric let you release your facial stress and help get into sleep rapidly.Bluetooth Version: 5.0Bluetooth Transmission Distance: 10mHeadphone channel: Stereo (2.0)Music Playing Time: Maximum Sound 8h, Medium Volume 12hMicrophone Distance: 1mBattery Capacity: 180ma/hBattery Power: 0.55WSpeaker Impedance: 32Speaker Power: 0.02WFrequency Range: 2.4-2.4835GHzCharging Time: 1-2hMaximum Input Voltage: DC 5VMaximum Input Current: 150mAhMaximum Input Power: 0.55WWeight: 150gColor: BlackPackage Size: 24 x 11 x 2.6cmMaterial: Cotton, PolyesterPackage List:1 x Eye Mask