Item Type: Silk Bluetooth Musical Eye MaskMaterial: SilkBluetooth Version: 5.0Transmission Distance: 20m/66ftChannel: StereoSpeaker Parameters: 32/10mmSignal to Noise Ratio: 104dBRechargeable Lithium Battery: 150mAh (Delivered with Battery)Playing Time: About 13 HoursTalk Time: About 14 HoursStandby Time: About 350 HoursCharging Time: About 2 HoursPackage List1 x Silk Bluetooth Sleep Eye Mask1 x Charging Cable1 x Manual1Silk material and skinfriendly, very comfortable to the touch, improving sleep quality and small in szie, durable and portable, you can use it everywhere. 2The builtin adjustable highquality speaker and microphone can realize handsfree clear call, and the builtin highperformance battery can be charged for about 2 hours, providing about 13 hours of playing time. 3Using the updated bluetooth 5.0 technology, stable connection, highspeed and longdistance transmission, low power consumption, bringing an excellent stereo experience. 4The sleep earphone eye mask uses 3 dimension ergonomics technology for the eye area, blocking light, creating absolute dark areas, listening to music without wearing additional headphones. 5The silk eye mask is very suitable for home, office, air travel, business trip, relaxation, meditation and insomnia, and you can sleep all night without being woken up. 6The bluetooth headset can be detached from the eye mask, which is convenient for cleaning the eye holder and keeps it clean and hygienic, the perfect partner for sleep.