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Model: 3D eye mask Bluetooth protocol: V5.0 Frequency range: 20HZ-20KHZ Charging voltage: 3.7V-4.2V Sensitivity: 88DM Signal to noise ratio: 90db Speaker impedance: 32- 15% Speaker specifications: φ30mm Operating range: 10m Charging time: 2H Use time: 10H (50% volume) Battery capacity: 200mAh lithium battery Bluetooth search name: BT-01 Material: memory foam Product size: 28*14cm Retail box size: 140mm*118mm*46mm 【Sleep Headphones & Bluetooth Sleep Mask & Sleep Eye Mask 3 in 1】Our Bluetooth sleep headphones Sleep Eye Mask is the latest and unique one in the market!The bluetooth eye mask for sleeping features a soft bluetooth headband design with wireless sleep headset inside,allow you to enjoy handsfree headphones music,and protect you from being disturbed by mess hair and sweat.Sleeping headphones bluetooth sleep mask is perfect suitable for Nap,Insomnia, Air Travel, Meditation,Yoga,sleeping 【Upgraded 3D Contour Design & No Eye Pressure】Our sleep mask with bluetooth headphones based on ergonomics.Our eyes can move freely with the 3D contoured bluetooth sleep mask. With no pressure on eyes, the bluetooth eye mask can bring you a comfortable and long-lasting sleep.The bluetooth sleep eye mask is the perfect Sleeping Headphones for side sleepers, chose our sleeping bluetooth headphones, fall asleep fast,have a sweet dream and won't be painful or fall out like earplugs 【Bluetooth V5.2 & 10 Hours Service Time & Premium Audio Quality】The bluetooth sleep headphones feature Bluetooth 5.0 version with quality chip,fast paring speed,less power consuming,ensure stable clear sound and lossless music. Bluetooth wireless music headphones 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 1-2 hours and provide 8-10 hours playing time 【Perfect 99% Light Blocking】The unique design of our bluetooth sleep mask fitted around the nose brings you a complete dark sleep environment. Even in bright places, you can be at ease for a nap or for the night by wearing the headphones for sleeping.The bluetooth sleep headphones wireless music eye mask also allows you to listen to music without wearing additional headphones. Get the benefits of total blackout, whether at home, in a hotel or on the plane, light blockout anywhere, anytime! 【Comfortable and Breathable Material, Washable】Bluetooth sleeping headphones is made of memory foam materials and super soft fabric-lightweight,skin-friendly,breathable,extremely stretchable.Bluetooth sleep headphones is washable just remove control pod first.Sleeping headphones Eye Mask are good choices of cool tech gadgets unique gifts for Thanksgiving Day, Christmas Stocking Stuffers, Secret Santa gifts, Birthday, Mother's Day, Valentine's Day for men women teenage boys girls