YR-04 Stereo Wireless Bluetooth V5.0 Sleep Headphones Calling Music 3D Sleep Eye Mask Cover Earphone Night Rest Shade Eyepatch Headset Feature: 1. Wireless Bluetooth function, music assisted sleep. 2. Three-dimensional design, according to the contour of the face with a comfortable 3D design perfectly fits the face. 3. Comfortable, breathable and not stuffy. 4. It adopts a curved shading design that completely fits the nose to prevent light from entering and affecting sleep. Specification: Model: YR-04 Material: Polyester + cotton Color: Black, Pink Bluetooth protocol: V5.0 Operating range: 10m/32.8ft Bluetooth search name: BT-01 Frequency range: 20Hz-20KHz Charging voltage: 3.7V-4.2V Charging current: 150-200mA Sensitivity: 88dB Signal to noise ratio: 90dB Speaker impedance: 32Ω±15% Speaker size: Diameter 30mm/1.18in Charging time: 2h Duration of use: 10h (60% volume) Battery capacity: 200mAh lithium battery Packing size: 190x120x35mm/7.48x4.72x1.38in Product gross weight: 168g Note: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement. 1 X Bluetooth Sleep Eye Mask 1 X Charging Cable 1 X Waterproof Bag 1 X Instruction