Bluetooth Sleeping Headphones Eye Mask Sleep Headphones Bluetooth Headband Soft Elastic Comfortable Wireless Music Earphones Bluetooth eye mask:Bluetooth sleep eye mask adopts V5.0 program, binaural stereo design, comfortable cotton fabric with comfortable and soft breathability. For people with symptoms ofsleep difficulties, they can let them slowly go to sleep while enjoying music, and can also reduce the outside world. The noise disturbance provides a quiet sleeping environment, whether it is work break or sleep at night, Bluetooth sleep eye mask can help improve sleep quality, a magical sleep aid artifact! Bluetooth connection: with iOS, Android, Mac and Windows 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: 30mm 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