YOUR WORLD, MUSIC WORLD Built-in HD sound quality speakers BUILT-IN BLUETOOTH 5.2 TECHNOLOGY Wireless transmission distance up to 33 feet BUILT-IN BLUETOOTH 5.2 TECHNOLOGY 1 SUPER COMFORTABLE2 LONG-LASTING BATTERY3 QUALITY SOUND4 BLUETOOTH 5.25 HANDS-FREE 3D Contour Design The contour of the eye area is deeper and your eyes can move freely without any pressure on the eyes. The new Sleep 3D Eye Mask brings you comfortable and long-lasting sleep. Up to 99% Light Blocking The ergonomic design fits your eyes perfectly, and the optimized nose wing design can block 99% of the light. Bluetooth 5.2 Get an ultra-fast and virtually unbreakable connection between MUSICOZY 3D sleep headphones and your mobile device. Compatible with smartphones, tablets, laptop computers, and more. Accessories In the box you’ll find a travel pouch to conveniently store 3D sleep headphones in, a charging cable to charge them with, and user manual.