Description: Sleeping Eye Mask: 5.0, binaural three-dimensional design, you can enjoy music without wearing additional headphones, and improve sleep quality. Unique 3D Contour Design: Comfortable Soft flannel cotton fabric, soft and breathable, has a wider and deeper eye space than traditional eye masks, will not cause pressure on your eyeballs and face, and will not rub your eyelids. Long Lasting battery life: Battery capacity, 200mah. 2-3 hours of charging, 10-12 hours of battery life, standby time, 300 days. Multipurpose: For naps, , travel, shift work, yoga, relaxation, audiobooks, meditation, etc. for home, office, car breaks or to block light from electronic devices. Perfect Gift: A great unique gift for men, women, teens, boys, girls, boyfriends, best friends, wives, husbands, teachers, travelers. Specification: Transmission distance: 10M type : 5.0 Frequency Response: 20HZ-20KHZ USB: micro USB Product size: 250x100x25mm/9.84x3.94x0.98inch Package Includes: 1 Piece Eye Mask 1 Piece Charging Cable 1 Piece Manual 1 Piece Matte Bag Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!