Specifications Bt Version:V5.0 Frequency:2.402 Ghz-2.480Ghz Transmission Range:20M/66FT Rated Power:RMS 10mW×2 Speaker Unit:32Q/20mm Battery:3.7v 180mAh Rechargeable Li-polymer Battery Charge Time:2 Hours 【The First 3D Contour Design Bluetooth Eye Mask】Based on ergonomics,LC-dolida sleep headphones bluetooth sleep mask is perfect for your face.The contours of the eyes area are deeper and your eyes can move freely. Zero pressure on eyes,the new 3D bluetooth eye mask for sleeping perfectly solves the tightness of the silk eye mask,bring you a comfortable and long-lasting sleep. With adjustable strap won't tangle your hair. the suitable head size of this bluetooth sleep mask is 22.4 in- 24.8 in. 【Bluetooth V5.0 with HD Stereo Sound and Long Battery Life】 The bluetooth sleeping mask with High-fidelity stereo sound,which produce great sound quality and provide a well-closed and immersed environment for your ears,Just lose yourself in the music! The Sleeping headphones Bluetooth sleep mask headphones charge only about 2 hours and provide 8-10 hours playing time,support a whole night. Please move the speakers to align the ears so that you can hear more clearly while using. 【Perfectly Block Out Light & Wireless Connection】LC-dolida Sleep headphones sleep mask with bluetooth headphones has a full coverage and unique nose area design,it can effectively block out light,prevent light leakage and makes your sleep better,this bluetooth sleep headphones wireless music eye mask also allows you to listen to music without wearing additional headphones,which make you fall asleep faster. Get the benefits of total blackout,whether at home,in a hotel or on the plane. 【Cool Comfortable Fabric and Stylish Shape】sleeping headphones mask use memory foam materials and super soft fabric. It's very lightweight,and Skin-friendly breathable fabric is comfortable to wear. Ideal for insomnia,migraine headaches and dry-eye sufferers,as the breathable,fibers of hypoallergenic material allows healthy oxygen in while keeping dry air out. Sunglasses-Shaped eye mask fits small face,also make you look fashion even at sleep.