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: 5.0 Bluetooth Transmission Distance: 10m Headphone channel: Stereo (2.0) Music Playing Time: Maximum Sound 8h, Medium Volume 12h Microphone Distance: 1m Battery Capacity: 180ma/h Battery Power: 0.55W Speaker Impedance: 32 Speaker Power: 0.02W Frequency Range: 2.4-2.4835GHz Charging Time: 1-2h Maximum Input Voltage: DC 5V Maximum Input Current: 150mAh Maximum Input Power: 0.55W Weight: 150g Color: Black Package Size: 24 x 11 x 2.6cm Material: Cotton, Polyester Package List: 1 x Eye Mask Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store