Features: Supports listening to music and answering calls, compatible with iOS, Android, WP systems, and can be used as long as the device has Bluetooth. Ergonomic design, very sturdy and lightweight, can be worn in the ear even during intense exercise, and will not feel uncomfortable after long-term use. Perfect for sports, training, and running. Specification Product Name: Headworn Wireless Bluetooth Music Eye Mask Bluetooth version: 5.0 Bluetooth transmission distance: 10M Audio output distortion: 0.6% Audio output signal-to-noise ratio: 93dB Charging time: 1-2 hours Maximum input voltage: DC 5V Maximum input current: 150mAH Maximum input power: 0.55W Package included Earphones * 1 Charging cable * 1 NOTED: Please charge for 1-2 hours upon receipt. After a long delivery, the battery is depleted. Notice Please charge for 1-2 hours upon receipt. After a long delivery, the battery is depleted.