This 3D Bluetooth eye mask will be your best choice to tune in to your music without wearing extra headphones. Features: Made of durable spandex fibers, extremely stretchable, and fits most head sizes, what is more, it's incredibly soft and comfortable. Feature a eye mask design with a wireless headset inside, allowing you to enjoy hands-free music. The Bluetooth eye mask can protect you from light during travel. Built-in 200mAh high-performance battery, the eye mask can be charged via a USB cable. Advanced Bluetooth V5.0 provides you with easy, fast, and stable pairing and connection with your phone. Perfect suitable for naps, air travel, gym, workout, running, yoga as well as sleeping. Specifications: Material: ‎Spandex Battery Type: Lithium Battery Battery Capacity: 200mAh Bluetooth Version: V5.0 Frequency Range: 2.4-2.4835GHZ Transmission Distance: 10 m Input Voltage: 5V Charging Time: About 2 hours Charging Port: USB Product Size(LxW): 45 x 11 cm Package Contents: 1 x Bluetooth Eye Mask 1 x USB Charging Cable 1 x Manual Please note: Due to manual measurement, there might be a tolerance in the product size. Due to the lighting effects and shooting angles, the color of the item and that shown in the picture might have a nuance.